diff --git a/packages/client/src/pages/admin/index.vue b/packages/client/src/pages/admin/index.vue
index 6b11650f48..210226f283 100644
--- a/packages/client/src/pages/admin/index.vue
+++ b/packages/client/src/pages/admin/index.vue
@@ -1,6 +1,6 @@
 <template>
 <div ref="el" class="hiyeyicy" :class="{ wide: !narrow }">
-	<div v-if="!narrow || page == null" class="nav">
+	<div v-if="!narrow || initialPage == null" class="nav">
 		<MkHeader :info="header"></MkHeader>
 	
 		<MkSpacer :content-max="700" :margin-min="16">
@@ -12,21 +12,21 @@
 				<MkInfo v-if="noMaintainerInformation" warn class="info">{{ $ts.noMaintainerInformationWarning }} <MkA to="/admin/settings" class="_link">{{ $ts.configure }}</MkA></MkInfo>
 				<MkInfo v-if="noBotProtection" warn class="info">{{ $ts.noBotProtectionWarning }} <MkA to="/admin/security" class="_link">{{ $ts.configure }}</MkA></MkInfo>
 
-				<MkSuperMenu :def="menuDef" :grid="page == null"></MkSuperMenu>
+				<MkSuperMenu :def="menuDef" :grid="initialPage == null"></MkSuperMenu>
 			</div>
 		</MkSpacer>
 	</div>
-	<div class="main">
+	<div v-if="!(narrow && initialPage == null)" class="main">
 		<MkStickyContainer>
 			<template #header><MkHeader v-if="childInfo && !childInfo.hideHeader" :info="childInfo"/></template>
-			<component :is="component" :ref="el => pageChanged(el)" :key="page" v-bind="pageProps"/>
+			<component :is="component" :ref="el => pageChanged(el)" :key="initialPage" v-bind="pageProps"/>
 		</MkStickyContainer>
 	</div>
 </div>
 </template>
 
-<script lang="ts">
-import { computed, defineAsyncComponent, defineComponent, isRef, nextTick, onMounted, reactive, ref, watch } from 'vue';
+<script lang="ts" setup>
+import { defineAsyncComponent, nextTick, onMounted, onUnmounted, provide, watch } from 'vue';
 import { i18n } from '@/i18n';
 import MkSuperMenu from '@/components/ui/super-menu.vue';
 import MkInfo from '@/components/ui/info.vue';
@@ -35,292 +35,277 @@ import { instance } from '@/instance';
 import * as symbols from '@/symbols';
 import * as os from '@/os';
 import { lookupUser } from '@/scripts/lookup-user';
+import { MisskeyNavigator } from '@/scripts/navigate';
 
-export default defineComponent({
-	components: {
-		MkSuperMenu,
-		MkInfo,
-	},
+const isEmpty = (x: string | null) => x == null || x === '';
 
-	provide: {
-		shouldOmitHeaderTitle: false,
-	},
+const nav = new MisskeyNavigator();
 
-	props: {
-		initialPage: {
-			type: String,
-			required: false
+const indexInfo = {
+	title: i18n.ts.controlPanel,
+	icon: 'fas fa-cog',
+	bg: 'var(--bg)',
+	hideHeader: true,
+};
+
+const props = defineProps<{
+	initialPage?: string,
+}>();
+
+provide('shouldOmitHeaderTitle', false);
+
+let INFO = $ref(indexInfo);
+let childInfo = $ref(null);
+let page = $ref(props.initialPage);
+let narrow = $ref(false);
+let view = $ref(null);
+let el = $ref(null);
+let pageProps = $ref({});
+let noMaintainerInformation = isEmpty(instance.maintainerName) || isEmpty(instance.maintainerEmail);
+let noBotProtection = !instance.enableHcaptcha && !instance.enableRecaptcha;
+
+const NARROW_THRESHOLD = 600;
+const ro = new ResizeObserver((entries, observer) => {
+	if (entries.length === 0) return;
+	narrow = entries[0].borderBoxSize[0].inlineSize < NARROW_THRESHOLD;
+});
+
+const menuDef = $computed(() => [{
+	title: i18n.ts.quickAction,
+	items: [{
+		type: 'button',
+		icon: 'fas fa-search',
+		text: i18n.ts.lookup,
+		action: lookup,
+	}, ...(instance.disableRegistration ? [{
+		type: 'button',
+		icon: 'fas fa-user',
+		text: i18n.ts.invite,
+		action: invite,
+	}] : [])],
+}, {
+	title: i18n.ts.administration,
+	items: [{
+		icon: 'fas fa-tachometer-alt',
+		text: i18n.ts.dashboard,
+		to: '/admin/overview',
+		active: props.initialPage === 'overview',
+	}, {
+		icon: 'fas fa-users',
+		text: i18n.ts.users,
+		to: '/admin/users',
+		active: props.initialPage === 'users',
+	}, {
+		icon: 'fas fa-laugh',
+		text: i18n.ts.customEmojis,
+		to: '/admin/emojis',
+		active: props.initialPage === 'emojis',
+	}, {
+		icon: 'fas fa-globe',
+		text: i18n.ts.federation,
+		to: '/admin/federation',
+		active: props.initialPage === 'federation',
+	}, {
+		icon: 'fas fa-clipboard-list',
+		text: i18n.ts.jobQueue,
+		to: '/admin/queue',
+		active: props.initialPage === 'queue',
+	}, {
+		icon: 'fas fa-cloud',
+		text: i18n.ts.files,
+		to: '/admin/files',
+		active: props.initialPage === 'files',
+	}, {
+		icon: 'fas fa-broadcast-tower',
+		text: i18n.ts.announcements,
+		to: '/admin/announcements',
+		active: props.initialPage === 'announcements',
+	}, {
+		icon: 'fas fa-audio-description',
+		text: i18n.ts.ads,
+		to: '/admin/ads',
+		active: props.initialPage === 'ads',
+	}, {
+		icon: 'fas fa-exclamation-circle',
+		text: i18n.ts.abuseReports,
+		to: '/admin/abuses',
+		active: props.initialPage === 'abuses',
+	}],
+}, {
+	title: i18n.ts.settings,
+	items: [{
+		icon: 'fas fa-cog',
+		text: i18n.ts.general,
+		to: '/admin/settings',
+		active: props.initialPage === 'settings',
+	}, {
+		icon: 'fas fa-envelope',
+		text: i18n.ts.emailServer,
+		to: '/admin/email-settings',
+		active: props.initialPage === 'email-settings',
+	}, {
+		icon: 'fas fa-cloud',
+		text: i18n.ts.objectStorage,
+		to: '/admin/object-storage',
+		active: props.initialPage === 'object-storage',
+	}, {
+		icon: 'fas fa-lock',
+		text: i18n.ts.security,
+		to: '/admin/security',
+		active: props.initialPage === 'security',
+	}, {
+		icon: 'fas fa-globe',
+		text: i18n.ts.relays,
+		to: '/admin/relays',
+		active: props.initialPage === 'relays',
+	}, {
+		icon: 'fas fa-share-alt',
+		text: i18n.ts.integration,
+		to: '/admin/integrations',
+		active: props.initialPage === 'integrations',
+	}, {
+		icon: 'fas fa-ban',
+		text: i18n.ts.instanceBlocking,
+		to: '/admin/instance-block',
+		active: props.initialPage === 'instance-block',
+	}, {
+		icon: 'fas fa-ghost',
+		text: i18n.ts.proxyAccount,
+		to: '/admin/proxy-account',
+		active: props.initialPage === 'proxy-account',
+	}, {
+		icon: 'fas fa-cogs',
+		text: i18n.ts.other,
+		to: '/admin/other-settings',
+		active: props.initialPage === 'other-settings',
+	}],
+}, {
+	title: i18n.ts.info,
+	items: [{
+		icon: 'fas fa-database',
+		text: i18n.ts.database,
+		to: '/admin/database',
+		active: props.initialPage === 'database',
+	}],
+}]);
+
+const component = $computed(() => {
+	if (props.initialPage == null) return null;
+	switch (props.initialPage) {
+		case 'overview': return defineAsyncComponent(() => import('./overview.vue'));
+		case 'users': return defineAsyncComponent(() => import('./users.vue'));
+		case 'emojis': return defineAsyncComponent(() => import('./emojis.vue'));
+		case 'federation': return defineAsyncComponent(() => import('../federation.vue'));
+		case 'queue': return defineAsyncComponent(() => import('./queue.vue'));
+		case 'files': return defineAsyncComponent(() => import('./files.vue'));
+		case 'announcements': return defineAsyncComponent(() => import('./announcements.vue'));
+		case 'ads': return defineAsyncComponent(() => import('./ads.vue'));
+		case 'database': return defineAsyncComponent(() => import('./database.vue'));
+		case 'abuses': return defineAsyncComponent(() => import('./abuses.vue'));
+		case 'settings': return defineAsyncComponent(() => import('./settings.vue'));
+		case 'email-settings': return defineAsyncComponent(() => import('./email-settings.vue'));
+		case 'object-storage': return defineAsyncComponent(() => import('./object-storage.vue'));
+		case 'security': return defineAsyncComponent(() => import('./security.vue'));
+		case 'relays': return defineAsyncComponent(() => import('./relays.vue'));
+		case 'integrations': return defineAsyncComponent(() => import('./integrations.vue'));
+		case 'instance-block': return defineAsyncComponent(() => import('./instance-block.vue'));
+		case 'proxy-account': return defineAsyncComponent(() => import('./proxy-account.vue'));
+		case 'other-settings': return defineAsyncComponent(() => import('./other-settings.vue'));
+	}
+});
+
+watch(component, () => {
+	pageProps = {};
+
+	nextTick(() => {
+		scroll(el, { top: 0 });
+	});
+}, { immediate: true });
+
+watch(() => props.initialPage, () => {
+	if (props.initialPage == null && !narrow) {
+		nav.push('/admin/overview');
+	} else {
+		if (props.initialPage == null) {
+			INFO = indexInfo;
 		}
-	},
+	}
+});
 
-	setup(props, context) {
-		const indexInfo = {
-			title: i18n.ts.controlPanel,
-			icon: 'fas fa-cog',
-			bg: 'var(--bg)',
-			hideHeader: true,
-		};
-		const INFO = ref(indexInfo);
-		const childInfo = ref(null);
-		const page = ref(props.initialPage);
-		const narrow = ref(false);
-		const view = ref(null);
-		const el = ref(null);
-		const pageChanged = (page) => {
-			if (page == null) return;
-			const viewInfo = page[symbols.PAGE_INFO];
-			if (isRef(viewInfo)) {
-				watch(viewInfo, () => {
-					childInfo.value = viewInfo.value;
-				}, { immediate: true });
-			} else {
-				childInfo.value = viewInfo;
-			}
-		};
-		const pageProps = ref({});
+watch(narrow, () => {
+	if (props.initialPage == null && !narrow) {
+		nav.push('/admin/overview');
+	}
+});
 
-		const isEmpty = (x: any) => x == null || x == '';
+onMounted(() => {
+	ro.observe(el);
 
-		const noMaintainerInformation = ref(false);
-		const noBotProtection = ref(false);
+	narrow = el.offsetWidth < NARROW_THRESHOLD;
+	if (props.initialPage == null && !narrow) {
+		nav.push('/admin/overview');
+	}
+});
 
-		os.api('meta', { detail: true }).then(meta => {
-			// TODO: 設定が完了しても残ったままになるので、ストリーミングでmeta更新イベントを受け取ってよしなに更新する
-			noMaintainerInformation.value = isEmpty(meta.maintainerName) || isEmpty(meta.maintainerEmail);
-			noBotProtection.value = !meta.enableHcaptcha && !meta.enableRecaptcha;
+onUnmounted(() => {
+	ro.disconnect();
+});
+
+const pageChanged = (page) => {
+	if (page == null) {
+		childInfo = null;
+	} else {
+		childInfo = page[symbols.PAGE_INFO];
+	}
+};
+
+const invite = () => {
+	os.api('admin/invite').then(x => {
+		os.alert({
+			type: 'info',
+			text: x.code
 		});
-
-		const menuDef = computed(() => [{
-			title: i18n.ts.quickAction,
-			items: [{
-				type: 'button',
-				icon: 'fas fa-search',
-				text: i18n.ts.lookup,
-				action: lookup,
-			}, ...(instance.disableRegistration ? [{
-				type: 'button',
-				icon: 'fas fa-user',
-				text: i18n.ts.invite,
-				action: invite,
-			}] : [])],
-		}, {
-			title: i18n.ts.administration,
-			items: [{
-				icon: 'fas fa-tachometer-alt',
-				text: i18n.ts.dashboard,
-				to: '/admin/overview',
-				active: page.value === 'overview',
-			}, {
-				icon: 'fas fa-users',
-				text: i18n.ts.users,
-				to: '/admin/users',
-				active: page.value === 'users',
-			}, {
-				icon: 'fas fa-laugh',
-				text: i18n.ts.customEmojis,
-				to: '/admin/emojis',
-				active: page.value === 'emojis',
-			}, {
-				icon: 'fas fa-globe',
-				text: i18n.ts.federation,
-				to: '/admin/federation',
-				active: page.value === 'federation',
-			}, {
-				icon: 'fas fa-clipboard-list',
-				text: i18n.ts.jobQueue,
-				to: '/admin/queue',
-				active: page.value === 'queue',
-			}, {
-				icon: 'fas fa-cloud',
-				text: i18n.ts.files,
-				to: '/admin/files',
-				active: page.value === 'files',
-			}, {
-				icon: 'fas fa-broadcast-tower',
-				text: i18n.ts.announcements,
-				to: '/admin/announcements',
-				active: page.value === 'announcements',
-			}, {
-				icon: 'fas fa-audio-description',
-				text: i18n.ts.ads,
-				to: '/admin/ads',
-				active: page.value === 'ads',
-			}, {
-				icon: 'fas fa-exclamation-circle',
-				text: i18n.ts.abuseReports,
-				to: '/admin/abuses',
-				active: page.value === 'abuses',
-			}],
-		}, {
-			title: i18n.ts.settings,
-			items: [{
-				icon: 'fas fa-cog',
-				text: i18n.ts.general,
-				to: '/admin/settings',
-				active: page.value === 'settings',
-			}, {
-				icon: 'fas fa-envelope',
-				text: i18n.ts.emailServer,
-				to: '/admin/email-settings',
-				active: page.value === 'email-settings',
-			}, {
-				icon: 'fas fa-cloud',
-				text: i18n.ts.objectStorage,
-				to: '/admin/object-storage',
-				active: page.value === 'object-storage',
-			}, {
-				icon: 'fas fa-lock',
-				text: i18n.ts.security,
-				to: '/admin/security',
-				active: page.value === 'security',
-			}, {
-				icon: 'fas fa-globe',
-				text: i18n.ts.relays,
-				to: '/admin/relays',
-				active: page.value === 'relays',
-			}, {
-				icon: 'fas fa-share-alt',
-				text: i18n.ts.integration,
-				to: '/admin/integrations',
-				active: page.value === 'integrations',
-			}, {
-				icon: 'fas fa-ban',
-				text: i18n.ts.instanceBlocking,
-				to: '/admin/instance-block',
-				active: page.value === 'instance-block',
-			}, {
-				icon: 'fas fa-ghost',
-				text: i18n.ts.proxyAccount,
-				to: '/admin/proxy-account',
-				active: page.value === 'proxy-account',
-			}, {
-				icon: 'fas fa-cogs',
-				text: i18n.ts.other,
-				to: '/admin/other-settings',
-				active: page.value === 'other-settings',
-			}],
-		}, {
-			title: i18n.ts.info,
-			items: [{
-				icon: 'fas fa-database',
-				text: i18n.ts.database,
-				to: '/admin/database',
-				active: page.value === 'database',
-			}],
-		}]);
-		const component = computed(() => {
-			if (page.value == null) return null;
-			switch (page.value) {
-				case 'overview': return defineAsyncComponent(() => import('./overview.vue'));
-				case 'users': return defineAsyncComponent(() => import('./users.vue'));
-				case 'emojis': return defineAsyncComponent(() => import('./emojis.vue'));
-				case 'federation': return defineAsyncComponent(() => import('../federation.vue'));
-				case 'queue': return defineAsyncComponent(() => import('./queue.vue'));
-				case 'files': return defineAsyncComponent(() => import('./files.vue'));
-				case 'announcements': return defineAsyncComponent(() => import('./announcements.vue'));
-				case 'ads': return defineAsyncComponent(() => import('./ads.vue'));
-				case 'database': return defineAsyncComponent(() => import('./database.vue'));
-				case 'abuses': return defineAsyncComponent(() => import('./abuses.vue'));
-				case 'settings': return defineAsyncComponent(() => import('./settings.vue'));
-				case 'email-settings': return defineAsyncComponent(() => import('./email-settings.vue'));
-				case 'object-storage': return defineAsyncComponent(() => import('./object-storage.vue'));
-				case 'security': return defineAsyncComponent(() => import('./security.vue'));
-				case 'relays': return defineAsyncComponent(() => import('./relays.vue'));
-				case 'integrations': return defineAsyncComponent(() => import('./integrations.vue'));
-				case 'instance-block': return defineAsyncComponent(() => import('./instance-block.vue'));
-				case 'proxy-account': return defineAsyncComponent(() => import('./proxy-account.vue'));
-				case 'other-settings': return defineAsyncComponent(() => import('./other-settings.vue'));
-			}
+	}).catch(e => {
+		os.alert({
+			type: 'error',
+			text: e
 		});
+	});
+};
 
-		watch(component, () => {
-			pageProps.value = {};
+const lookup = (ev) => {
+	os.popupMenu([{
+		text: i18n.ts.user,
+		icon: 'fas fa-user',
+		action: () => {
+			lookupUser();
+		}
+	}, {
+		text: i18n.ts.note,
+		icon: 'fas fa-pencil-alt',
+		action: () => {
+			alert('TODO');
+		}
+	}, {
+		text: i18n.ts.file,
+		icon: 'fas fa-cloud',
+		action: () => {
+			alert('TODO');
+		}
+	}, {
+		text: i18n.ts.instance,
+		icon: 'fas fa-globe',
+		action: () => {
+			alert('TODO');
+		}
+	}], ev.currentTarget ?? ev.target);
+};
 
-			nextTick(() => {
-				scroll(el.value, { top: 0 });
-			});
-		}, { immediate: true });
-
-		watch(() => props.initialPage, () => {
-			if (props.initialPage == null && !narrow.value) {
-				page.value = 'overview';
-			} else {
-				page.value = props.initialPage;
-				if (props.initialPage == null) {
-					INFO.value = indexInfo;
-				}
-			}
-		});
-
-		onMounted(() => {
-			narrow.value = el.value.offsetWidth < 800;
-			if (!narrow.value) {
-				page.value = 'overview';
-			}
-		});
-
-		const invite = () => {
-			os.api('admin/invite').then(x => {
-				os.alert({
-					type: 'info',
-					text: x.code
-				});
-			}).catch(e => {
-				os.alert({
-					type: 'error',
-					text: e
-				});
-			});
-		};
-
-		const lookup = (ev) => {
-			os.popupMenu([{
-				text: i18n.ts.user,
-				icon: 'fas fa-user',
-				action: () => {
-					lookupUser();
-				}
-			}, {
-				text: i18n.ts.note,
-				icon: 'fas fa-pencil-alt',
-				action: () => {
-					alert('TODO');
-				}
-			}, {
-				text: i18n.ts.file,
-				icon: 'fas fa-cloud',
-				action: () => {
-					alert('TODO');
-				}
-			}, {
-				text: i18n.ts.instance,
-				icon: 'fas fa-globe',
-				action: () => {
-					alert('TODO');
-				}
-			}], ev.currentTarget ?? ev.target);
-		};
-
-		return {
-			[symbols.PAGE_INFO]: INFO,
-			menuDef,
-			header: {
-				title: i18n.ts.controlPanel,
-			},
-			noMaintainerInformation,
-			noBotProtection,
-			page,
-			narrow,
-			view,
-			el,
-			pageChanged,
-			childInfo,
-			pageProps,
-			component,
-			invite,
-			lookup,
-		};
-	},
+defineExpose({
+	[symbols.PAGE_INFO]: INFO,
+	header: {
+		title: i18n.ts.controlPanel,
+	}
 });
 </script>