diff --git a/packages/backend/src/server/api/endpoints/users/search-by-username-and-host.ts b/packages/backend/src/server/api/endpoints/users/search-by-username-and-host.ts
index eeccf69386..f34083233f 100644
--- a/packages/backend/src/server/api/endpoints/users/search-by-username-and-host.ts
+++ b/packages/backend/src/server/api/endpoints/users/search-by-username-and-host.ts
@@ -32,6 +32,12 @@ export const paramDef = {
 		username: { type: "string", nullable: true },
 		host: { type: "string", nullable: true },
 		limit: { type: "integer", minimum: 1, maximum: 100, default: 10 },
+		maxDaysSinceLastActive: {
+			type: "integer",
+			minimum: 1,
+			maximum: 1000,
+			default: 30,
+		},
 		detail: { type: "boolean", default: true },
 	},
 	anyOf: [{ required: ["username"] }, { required: ["host"] }],
@@ -40,7 +46,9 @@ export const paramDef = {
 // TODO: avatar,bannerをJOINしたいけどエラーになる
 
 export default define(meta, paramDef, async (ps, me) => {
-	const activeThreshold = new Date(Date.now() - 1000 * 60 * 60 * 24 * 30); // 30日
+	const activeThreshold = ps.maxDaysSinceLastActive
+		? new Date(Date.now() - 1000 * 60 * 60 * 24 * ps.maxDaysSinceLastActive)
+		: null;
 
 	if (ps.host) {
 		const q = Users.createQueryBuilder("user")
@@ -75,8 +83,10 @@ export default define(meta, paramDef, async (ps, me) => {
 				.andWhere("user.isSuspended = FALSE")
 				.andWhere("user.usernameLower LIKE :username", {
 					username: `${sqlLikeEscape(ps.username.toLowerCase())}%`,
-				})
-				.andWhere(
+				});
+
+			if (activeThreshold) {
+				query.andWhere(
 					new Brackets((qb) => {
 						qb.where("user.updatedAt IS NULL").orWhere(
 							"user.updatedAt > :activeThreshold",
@@ -84,6 +94,7 @@ export default define(meta, paramDef, async (ps, me) => {
 						);
 					}),
 				);
+			}
 
 			query.setParameters(followingQuery.getParameters());
 
diff --git a/packages/client/src/components/MkUserSelectLocalDialog.vue b/packages/client/src/components/MkUserSelectLocalDialog.vue
new file mode 100644
index 0000000000..e74a63da27
--- /dev/null
+++ b/packages/client/src/components/MkUserSelectLocalDialog.vue
@@ -0,0 +1,223 @@
+<template>
+	<XModalWindow
+		ref="dialogEl"
+		:with-ok-button="true"
+		:ok-button-disabled="selected == null"
+		@click="cancel()"
+		@close="cancel()"
+		@ok="ok()"
+		@closed="$emit('closed')"
+	>
+		<template #header>{{ i18n.ts.selectUser }}</template>
+		<div class="tbhwbxdg">
+			<div class="form">
+				<FormSplit :min-width="170">
+					<MkInput
+						v-model="username"
+						:autofocus="true"
+						@update:modelValue="search"
+					>
+						<template #label>{{ i18n.ts.username }}</template>
+						<template #prefix>@</template>
+					</MkInput>
+				</FormSplit>
+			</div>
+			<div
+				v-if="username != '' || host != ''"
+				class="result"
+				:class="{ hit: users.length > 0 }"
+			>
+				<div v-if="users.length > 0" class="users">
+					<div
+						v-for="user in users"
+						:key="user.id"
+						class="user"
+						:class="{
+							selected: selected && selected.id === user.id,
+						}"
+						@click="selected = user"
+						@dblclick="ok()"
+					>
+						<MkAvatar
+							:user="user"
+							class="avatar"
+							:show-indicator="true"
+							disableLink
+						/>
+						<div class="body">
+							<MkUserName :user="user" class="name" />
+							<MkAcct :user="user" class="acct" />
+						</div>
+					</div>
+				</div>
+				<div v-else class="empty">
+					<span>{{ i18n.ts.noUsers }}</span>
+				</div>
+			</div>
+			<div v-if="username == '' && host == ''" class="recent">
+				<div class="users">
+					<div
+						v-for="user in recentUsers"
+						:key="user.id"
+						class="user"
+						:class="{
+							selected: selected && selected.id === user.id,
+						}"
+						@click="selected = user"
+						@dblclick="ok()"
+					>
+						<MkAvatar
+							:user="user"
+							class="avatar"
+							:show-indicator="true"
+							disableLink
+						/>
+						<div class="body">
+							<MkUserName :user="user" class="name" />
+							<MkAcct :user="user" class="acct" />
+						</div>
+					</div>
+				</div>
+			</div>
+		</div>
+	</XModalWindow>
+</template>
+
+<script lang="ts" setup>
+import { nextTick, onMounted } from "vue";
+import * as misskey from "calckey-js";
+import MkInput from "@/components/form/input.vue";
+import FormSplit from "@/components/form/split.vue";
+import XModalWindow from "@/components/MkModalWindow.vue";
+import * as os from "@/os";
+import { defaultStore } from "@/store";
+import { i18n } from "@/i18n";
+
+const emit = defineEmits<{
+	(ev: "ok", selected: misskey.entities.UserDetailed): void;
+	(ev: "cancel"): void;
+	(ev: "closed"): void;
+}>();
+
+let username = $ref("");
+let host = $ref("");
+let users: misskey.entities.UserDetailed[] = $ref([]);
+let recentUsers: misskey.entities.UserDetailed[] = $ref([]);
+let selected: misskey.entities.UserDetailed | null = $ref(null);
+let dialogEl = $ref();
+
+const search = () => {
+	if (username === "" && host === "") {
+		users = [];
+		return;
+	}
+	os.api("users/search-by-username-and-host", {
+		username: username,
+		host: null,
+		limit: 10,
+		detail: false,
+	}).then((_users) => {
+		users = _users;
+	});
+};
+
+const ok = () => {
+	if (selected == null) return;
+	emit("ok", selected);
+	dialogEl.close();
+
+	// 最近使ったユーザー更新
+	let recents = defaultStore.state.recentlyUsedUsers;
+	recents = recents.filter((x) => x !== selected.id);
+	recents.unshift(selected.id);
+	defaultStore.set("recentlyUsedUsers", recents.splice(0, 16));
+};
+
+const cancel = () => {
+	emit("cancel");
+	dialogEl.close();
+};
+
+onMounted(() => {
+	os.api("users/show", {
+		userIds: defaultStore.state.recentlyUsedUsers,
+	}).then((users) => {
+		recentUsers = users;
+	});
+});
+</script>
+
+<style lang="scss" scoped>
+.tbhwbxdg {
+	> .form {
+		padding: 0 var(--root-margin);
+	}
+
+	> .result,
+	> .recent {
+		display: flex;
+		flex-direction: column;
+		overflow: auto;
+		height: 100%;
+
+		&.result.hit {
+			padding: 0;
+		}
+
+		&.recent {
+			padding: 0;
+		}
+
+		> .users {
+			flex: 1;
+			overflow: auto;
+			padding: 8px 0;
+
+			> .user {
+				display: flex;
+				align-items: center;
+				padding: 8px var(--root-margin);
+				font-size: 14px;
+
+				&:hover {
+					background: var(--X7);
+				}
+
+				&.selected {
+					background: var(--accent);
+					color: #fff;
+				}
+
+				> * {
+					pointer-events: none;
+					user-select: none;
+				}
+
+				> .avatar {
+					width: 45px;
+					height: 45px;
+				}
+
+				> .body {
+					padding: 0 8px;
+					min-width: 0;
+
+					> .name {
+						display: block;
+						font-weight: bold;
+					}
+
+					> .acct {
+						opacity: 0.5;
+					}
+				}
+			}
+		}
+
+		> .empty {
+			opacity: 0.7;
+			text-align: center;
+		}
+	}
+}
+</style>
diff --git a/packages/client/src/os.ts b/packages/client/src/os.ts
index 32bb8f76b1..0802d8e345 100644
--- a/packages/client/src/os.ts
+++ b/packages/client/src/os.ts
@@ -631,6 +631,25 @@ export async function selectUser() {
 	});
 }
 
+export async function selectLocalUser() {
+	return new Promise((resolve, reject) => {
+		popup(
+			defineAsyncComponent({
+				loader: () => import("@/components/MkUserSelectLocalDialog.vue"),
+				loadingComponent: MkWaitingDialog,
+				delay: 1000,
+			}),
+			{},
+			{
+				ok: (user) => {
+					resolve(user);
+				},
+			},
+			"closed",
+		);
+	});
+}
+
 export async function selectInstance(): Promise<Misskey.entities.Instance> {
 	return new Promise((resolve, reject) => {
 		popup(
diff --git a/packages/client/src/pages/admin/proxy-account.vue b/packages/client/src/pages/admin/proxy-account.vue
index 87b3c684e2..7d72b0ac0f 100644
--- a/packages/client/src/pages/admin/proxy-account.vue
+++ b/packages/client/src/pages/admin/proxy-account.vue
@@ -20,12 +20,15 @@
 					}}</template>
 				</MkKeyValue>
 
-				<FormButton
+				<MkButton
 					primary
 					class="_formBlock"
 					@click="chooseProxyAccount"
-					>{{ i18n.ts.selectAccount }}</FormButton
+					>{{ i18n.ts.selectAccount }}</MkButton
 				>
+				<MkButton danger class="_formBlock" @click="del">{{
+					i18n.ts.remove
+				}}</MkButton>
 			</FormSuspense>
 		</MkSpacer>
 	</MkStickyContainer>
@@ -34,7 +37,7 @@
 <script lang="ts" setup>
 import {} from "vue";
 import MkKeyValue from "@/components/MkKeyValue.vue";
-import FormButton from "@/components/MkButton.vue";
+import MkButton from "@/components/MkButton.vue";
 import MkInfo from "@/components/MkInfo.vue";
 import FormSuspense from "@/components/form/suspense.vue";
 import * as os from "@/os";
@@ -54,7 +57,7 @@ async function init() {
 }
 
 function chooseProxyAccount() {
-	os.selectUser().then((user) => {
+	os.selectLocalUser().then((user) => {
 		proxyAccount = user;
 		proxyAccountId = user.id;
 		save();
@@ -69,6 +72,14 @@ function save() {
 	});
 }
 
+function del() {
+	os.apiWithDialog("admin/update-meta", {
+		proxyAccountId: null,
+	}).then(() => {
+		fetchInstance();
+	});
+}
+
 const headerActions = $computed(() => []);
 
 const headerTabs = $computed(() => []);
diff --git a/packages/client/src/pages/my-groups/group.vue b/packages/client/src/pages/my-groups/group.vue
index 192572db1e..e6c7db1fb0 100644
--- a/packages/client/src/pages/my-groups/group.vue
+++ b/packages/client/src/pages/my-groups/group.vue
@@ -77,7 +77,7 @@ async function fetch() {
 fetch();
 
 function invite() {
-	os.selectUser().then((user) => {
+	os.selectLocalUser().then((user) => {
 		os.apiWithDialog("users/groups/invite", {
 			groupId: group.value.id,
 			userId: user.id,
@@ -110,7 +110,7 @@ async function renameGroup() {
 }
 
 function transfer() {
-	os.selectUser().then((user) => {
+	os.selectLocalUser().then((user) => {
 		os.apiWithDialog("users/groups/transfer", {
 			groupId: group.value.id,
 			userId: user.id,