diff --git a/CHANGELOG.md b/CHANGELOG.md
index f49a4335b1..21ce5932b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@
 	- チャットなど、一部の機能は引き続き設定に関わらずWebsocket接続が行われます
 - Feat: 絵文字をミュート可能にする機能
   - 絵文字（ユニコードの絵文字・カスタム絵文字）毎にミュートし、不可視化することができるようになりました
+- Feat: モバイルデバイスで折りたたまれたUIの展開表示に全画面ページを使用できるように(実験的)
 - Enhance: メモリ使用量を軽減しました
 - Enhance: 画像の高品質なプレースホルダを無効化してパフォーマンスを向上させるオプションを追加
 - Enhance: 招待されているが参加していないルームを開いたときに、招待を承認するかどうか尋ねるように
diff --git a/packages/frontend/src/components/MkFolder.vue b/packages/frontend/src/components/MkFolder.vue
index e86861c874..9f5bc8da6c 100644
--- a/packages/frontend/src/components/MkFolder.vue
+++ b/packages/frontend/src/components/MkFolder.vue
@@ -19,13 +19,42 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</div>
 				<div :class="$style.headerRight">
 					<span :class="$style.headerRightText"><slot name="suffix"></slot></span>
-					<i v-if="opened" class="ti ti-chevron-up icon"></i>
+					<i v-if="asPage" class="ti ti-chevron-right icon"></i>
+					<i v-else-if="opened" class="ti ti-chevron-up icon"></i>
 					<i v-else class="ti ti-chevron-down icon"></i>
 				</div>
 			</button>
 		</template>
 
-		<div v-if="openedAtLeastOnce" :class="[$style.body, { [$style.bgSame]: bgSame }]" :style="{ maxHeight: maxHeight ? `${maxHeight}px` : undefined, overflow: maxHeight ? `auto` : undefined }" :aria-hidden="!opened">
+		<div v-if="asPage">
+			<Teleport v-if="opened" defer :to="`#v-${pageId}-header`">
+				<slot name="label"></slot>
+			</Teleport>
+			<Teleport v-if="opened" defer :to="`#v-${pageId}-body`">
+				<MkStickyContainer>
+					<template #header>
+						<div v-if="$slots.header" :class="$style.inBodyHeader">
+							<slot name="header"></slot>
+						</div>
+					</template>
+
+					<div v-if="withSpacer" class="_spacer" :style="{ '--MI_SPACER-min': props.spacerMin + 'px', '--MI_SPACER-max': props.spacerMax + 'px' }">
+						<slot></slot>
+					</div>
+					<div v-else>
+						<slot></slot>
+					</div>
+
+					<template #footer>
+						<div v-if="$slots.footer" :class="$style.inBodyFooter">
+							<slot name="footer"></slot>
+						</div>
+					</template>
+				</MkStickyContainer>
+			</Teleport>
+		</div>
+
+		<div v-else-if="openedAtLeastOnce" :class="[$style.body, { [$style.bgSame]: bgSame }]" :style="{ maxHeight: maxHeight ? `${maxHeight}px` : undefined, overflow: maxHeight ? `auto` : undefined }" :aria-hidden="!opened">
 			<Transition
 				:enterActiveClass="prefer.s.animation ? $style.transition_toggle_enterActive : ''"
 				:leaveActiveClass="prefer.s.animation ? $style.transition_toggle_leaveActive : ''"
@@ -70,6 +99,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 import { nextTick, onMounted, ref, useTemplateRef } from 'vue';
 import { prefer } from '@/preferences.js';
 import { getBgColor } from '@/utility/get-bg-color.js';
+import { pageFolderTeleportCount, popup } from '@/os.js';
+import MkFolderPage from '@/components/MkFolderPage.vue';
+import { deviceKind } from '@/utility/device-kind.js';
 
 const props = withDefaults(defineProps<{
 	defaultOpen?: boolean;
@@ -77,18 +109,21 @@ const props = withDefaults(defineProps<{
 	withSpacer?: boolean;
 	spacerMin?: number;
 	spacerMax?: number;
+	canPage?: boolean;
 }>(), {
 	defaultOpen: false,
 	maxHeight: null,
 	withSpacer: true,
 	spacerMin: 14,
 	spacerMax: 22,
+	canPage: true,
 });
 
 const rootEl = useTemplateRef('rootEl');
+const asPage = props.canPage && deviceKind === 'smartphone' && prefer.s['experimental.enableFolderPageView'];
 const bgSame = ref(false);
-const opened = ref(props.defaultOpen);
-const openedAtLeastOnce = ref(props.defaultOpen);
+const opened = ref(asPage ? false : props.defaultOpen);
+const openedAtLeastOnce = ref(opened.value);
 
 //#region interpolate-sizeに対応していないブラウザ向け（TODO: 主要ブラウザが対応したら消す）
 function enter(el: Element) {
@@ -126,7 +161,22 @@ function afterLeave(el: Element) {
 }
 //#endregion
 
-function toggle() {
+let pageId = pageFolderTeleportCount.value;
+pageFolderTeleportCount.value += 1000;
+
+async function toggle() {
+	if (asPage && !opened.value) {
+		pageId++;
+		const { dispose } = await popup(MkFolderPage, {
+			pageId,
+		}, {
+			closed: () => {
+				opened.value = false;
+				dispose();
+			},
+		});
+	}
+
 	if (!opened.value) {
 		openedAtLeastOnce.value = true;
 	}
diff --git a/packages/frontend/src/components/MkFolderPage.vue b/packages/frontend/src/components/MkFolderPage.vue
new file mode 100644
index 0000000000..6d9ee1af1d
--- /dev/null
+++ b/packages/frontend/src/components/MkFolderPage.vue
@@ -0,0 +1,157 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<Transition
+	name="x"
+	:enterActiveClass="prefer.s.animation ? $style.transition_x_enterActive : ''"
+	:leaveActiveClass="prefer.s.animation ? $style.transition_x_leaveActive : ''"
+	:enterFromClass="prefer.s.animation ? $style.transition_x_enterFrom : ''"
+	:leaveToClass="prefer.s.animation ? $style.transition_x_leaveTo : ''"
+	:duration="300" appear @afterLeave="onClosed"
+>
+	<div v-show="showing" :class="[$style.root]" :style="{ zIndex }">
+		<div :class="[$style.bg]" :style="{ zIndex }"></div>
+		<div :class="[$style.content]" :style="{ zIndex }">
+			<div :class="$style.header">
+				<button :class="$style.back" class="_button" @click="closePage"><i class="ti ti-chevron-left"></i></button>
+				<div :id="`v-${pageId}-header`" :class="$style.title"></div>
+				<div :class="$style.spacer"></div>
+			</div>
+			<div :id="`v-${pageId}-body`"></div>
+		</div>
+	</div>
+</Transition>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, ref } from 'vue';
+import { claimZIndex } from '@/os.js';
+import { prefer } from '@/preferences.js';
+
+const props = withDefaults(defineProps<{
+	pageId: number,
+}>(), {
+	pageId: 0,
+});
+
+const emit = defineEmits<{
+	(_: 'closed'): void
+}>();
+
+const zIndex = claimZIndex('middle');
+const showing = ref(true);
+
+function closePage() {
+	showing.value = false;
+}
+
+function onClosed() {
+	emit('closed');
+}
+
+</script>
+
+<style lang="scss" module>
+.transition_x_enterActive {
+	> .bg {
+		transition: opacity 0.3s !important;
+	}
+
+	> .content {
+		transition: transform 0.3s cubic-bezier(0,0,.25,1) !important;
+	}
+}
+.transition_x_leaveActive {
+	> .bg {
+		transition: opacity 0.3s !important;
+	}
+
+	> .content {
+		transition: transform 0.3s cubic-bezier(0,0,.25,1) !important;
+	}
+}
+.transition_x_enterFrom,
+.transition_x_leaveTo {
+	> .bg {
+		opacity: 0;
+	}
+
+	> .content {
+		pointer-events: none;
+		transform: translateX(100%);
+	}
+}
+
+.root {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	overflow: clip;
+}
+
+.bg {
+	position: fixed;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	background: var(--MI_THEME-modalBg);
+}
+
+.content {
+	position: fixed;
+	bottom: 0;
+	left: 0;
+	right: 0;
+	width: 100%;
+	height: 100%;
+	margin: auto;
+	background: var(--MI_THEME-bg);
+	container-type: size;
+	overflow: auto;
+	overscroll-behavior: contain;
+}
+
+.header {
+	--height: 48px;
+
+	position: sticky;
+	top: 0;
+	left: 0;
+	height: var(--height);
+	z-index: 1;
+	display: flex;
+	align-items: center;
+	background: color(from var(--MI_THEME-panel) srgb r g b / 0.75);
+	-webkit-backdrop-filter: var(--MI-blur, blur(15px));
+	backdrop-filter: var(--MI-blur, blur(15px));
+	border-bottom: solid 0.5px var(--MI_THEME-divider);
+}
+
+.back {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	width: var(--height);
+	height: var(--height);
+	font-size: 16px;
+	color: var(--MI_THEME-accent);
+}
+
+.title {
+	margin: 0 auto;
+	white-space: nowrap;
+	text-overflow: ellipsis;
+	overflow: hidden;
+}
+
+.spacer {
+	width: var(--height);
+	height: var(--height);
+}
+</style>
diff --git a/packages/frontend/src/os.ts b/packages/frontend/src/os.ts
index fea050e787..a513ae4902 100644
--- a/packages/frontend/src/os.ts
+++ b/packages/frontend/src/os.ts
@@ -790,3 +790,5 @@ export function launchUploader(
 		});
 	});
 }
+
+export const pageFolderTeleportCount = ref(0);
diff --git a/packages/frontend/src/pages/settings/other.vue b/packages/frontend/src/pages/settings/other.vue
index 83a6aa167c..7b6ad5e56e 100644
--- a/packages/frontend/src/pages/settings/other.vue
+++ b/packages/frontend/src/pages/settings/other.vue
@@ -96,6 +96,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkSwitch v-model="stackingRouterView">
 							<template #label>Enable stacking router view</template>
 						</MkSwitch>
+						<MkSwitch v-model="enableFolderPageView">
+							<template #label>Enable folder page view</template>
+						</MkSwitch>
 					</div>
 				</MkFolder>
 			</SearchMarker>
@@ -157,6 +160,7 @@ const enableCondensedLine = prefer.model('enableCondensedLine');
 const skipNoteRender = prefer.model('skipNoteRender');
 const devMode = prefer.model('devMode');
 const stackingRouterView = prefer.model('experimental.stackingRouterView');
+const enableFolderPageView = prefer.model('experimental.enableFolderPageView');
 
 watch(skipNoteRender, async () => {
 	await reloadAsk({ reason: i18n.ts.reloadToApplySetting, unison: true });
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index 7b0628e937..27402a8e6a 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -417,4 +417,7 @@ export const PREF_DEF = {
 	'experimental.stackingRouterView': {
 		default: false,
 	},
+	'experimental.enableFolderPageView': {
+		default: false,
+	},
 } satisfies PreferencesDefinition;