diff --git a/idea/MkDisableSection.vue b/idea/MkDisableSection.vue
new file mode 100644
index 0000000000..d177886569
--- /dev/null
+++ b/idea/MkDisableSection.vue
@@ -0,0 +1,41 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="[$style.root]">
+	<div :inert="disabled" :class="[{ [$style.disabled]: disabled }]">
+		<slot></slot>
+	</div>
+	<div v-if="disabled" :class="[$style.cover]"></div>
+</div>
+</template>
+
+<script lang="ts" setup>
+defineProps<{
+	disabled?: boolean;
+}>();
+</script>
+
+<style lang="scss" module>
+.root {
+	position: relative;
+}
+
+.disabled {
+	opacity: 0.7;
+}
+
+.cover {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	cursor: not-allowed;
+	--color: color(from var(--error) srgb r g b / 0.25);
+	background-size: auto auto;
+	background-image: repeating-linear-gradient(135deg, transparent, transparent 10px, var(--color) 4px, var(--color) 14px);
+}
+</style>
diff --git a/idea/README.md b/idea/README.md
new file mode 100644
index 0000000000..f64d16800a
--- /dev/null
+++ b/idea/README.md
@@ -0,0 +1 @@
+使われなくなったけど消すのは勿体ない(将来使えるかもしれない)コードを入れておくとこ
diff --git a/packages/frontend/src/pages/admin/performance.vue b/packages/frontend/src/pages/admin/performance.vue
index 57f68a2a26..7e0a932f82 100644
--- a/packages/frontend/src/pages/admin/performance.vue
+++ b/packages/frontend/src/pages/admin/performance.vue
@@ -45,7 +45,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkFormFooter :form="fttForm"/>
 				</template>
 
-				<div class="_gaps_m">
+				<div class="_gaps">
 					<MkSwitch v-model="fttForm.state.enableFanoutTimeline">
 						<template #label>{{ i18n.ts.enable }}<span v-if="fttForm.modifiedStates.enableFanoutTimeline" class="_modified">{{ i18n.ts.modified }}</span></template>
 						<template #caption>
@@ -54,26 +54,28 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</template>
 					</MkSwitch>
 
-					<MkSwitch v-model="fttForm.state.enableFanoutTimelineDbFallback">
-						<template #label>{{ i18n.ts._serverSettings.fanoutTimelineDbFallback }}<span v-if="fttForm.modifiedStates.enableFanoutTimelineDbFallback" class="_modified">{{ i18n.ts.modified }}</span></template>
-						<template #caption>{{ i18n.ts._serverSettings.fanoutTimelineDbFallbackDescription }}</template>
-					</MkSwitch>
+					<template v-if="fttForm.state.enableFanoutTimeline">
+						<MkSwitch v-model="fttForm.state.enableFanoutTimelineDbFallback">
+							<template #label>{{ i18n.ts._serverSettings.fanoutTimelineDbFallback }}<span v-if="fttForm.modifiedStates.enableFanoutTimelineDbFallback" class="_modified">{{ i18n.ts.modified }}</span></template>
+							<template #caption>{{ i18n.ts._serverSettings.fanoutTimelineDbFallbackDescription }}</template>
+						</MkSwitch>
 
-					<MkInput v-model="fttForm.state.perLocalUserUserTimelineCacheMax" type="number">
-						<template #label>perLocalUserUserTimelineCacheMax<span v-if="fttForm.modifiedStates.perLocalUserUserTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
-					</MkInput>
+						<MkInput v-model="fttForm.state.perLocalUserUserTimelineCacheMax" type="number">
+							<template #label>perLocalUserUserTimelineCacheMax<span v-if="fttForm.modifiedStates.perLocalUserUserTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
+						</MkInput>
 
-					<MkInput v-model="fttForm.state.perRemoteUserUserTimelineCacheMax" type="number">
-						<template #label>perRemoteUserUserTimelineCacheMax<span v-if="fttForm.modifiedStates.perRemoteUserUserTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
-					</MkInput>
+						<MkInput v-model="fttForm.state.perRemoteUserUserTimelineCacheMax" type="number">
+							<template #label>perRemoteUserUserTimelineCacheMax<span v-if="fttForm.modifiedStates.perRemoteUserUserTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
+						</MkInput>
 
-					<MkInput v-model="fttForm.state.perUserHomeTimelineCacheMax" type="number">
-						<template #label>perUserHomeTimelineCacheMax<span v-if="fttForm.modifiedStates.perUserHomeTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
-					</MkInput>
+						<MkInput v-model="fttForm.state.perUserHomeTimelineCacheMax" type="number">
+							<template #label>perUserHomeTimelineCacheMax<span v-if="fttForm.modifiedStates.perUserHomeTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
+						</MkInput>
 
-					<MkInput v-model="fttForm.state.perUserListTimelineCacheMax" type="number">
-						<template #label>perUserListTimelineCacheMax<span v-if="fttForm.modifiedStates.perUserListTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
-					</MkInput>
+						<MkInput v-model="fttForm.state.perUserListTimelineCacheMax" type="number">
+							<template #label>perUserListTimelineCacheMax<span v-if="fttForm.modifiedStates.perUserListTimelineCacheMax" class="_modified">{{ i18n.ts.modified }}</span></template>
+						</MkInput>
+					</template>
 				</div>
 			</MkFolder>
 
@@ -110,7 +112,6 @@ import MkSwitch from '@/components/MkSwitch.vue';
 import MkFolder from '@/components/MkFolder.vue';
 import MkInput from '@/components/MkInput.vue';
 import MkLink from '@/components/MkLink.vue';
-import MkButton from '@/components/MkButton.vue';
 import { useForm } from '@/scripts/use-form.js';
 import MkFormFooter from '@/components/MkFormFooter.vue';
 
diff --git a/packages/frontend/src/pages/admin/settings.vue b/packages/frontend/src/pages/admin/settings.vue
index 537c86cb14..5207f0e38e 100644
--- a/packages/frontend/src/pages/admin/settings.vue
+++ b/packages/frontend/src/pages/admin/settings.vue
@@ -169,42 +169,44 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<template #label>{{ i18n.ts._urlPreviewSetting.enable }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewEnabled" class="_modified">{{ i18n.ts.modified }}</span></template>
 						</MkSwitch>
 
-						<MkSwitch v-model="urlPreviewForm.state.urlPreviewRequireContentLength">
-							<template #label>{{ i18n.ts._urlPreviewSetting.requireContentLength }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewRequireContentLength" class="_modified">{{ i18n.ts.modified }}</span></template>
-							<template #caption>{{ i18n.ts._urlPreviewSetting.requireContentLengthDescription }}</template>
-						</MkSwitch>
+						<template v-if="urlPreviewForm.state.urlPreviewEnabled">
+							<MkSwitch v-model="urlPreviewForm.state.urlPreviewRequireContentLength">
+								<template #label>{{ i18n.ts._urlPreviewSetting.requireContentLength }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewRequireContentLength" class="_modified">{{ i18n.ts.modified }}</span></template>
+								<template #caption>{{ i18n.ts._urlPreviewSetting.requireContentLengthDescription }}</template>
+							</MkSwitch>
 
-						<MkInput v-model="urlPreviewForm.state.urlPreviewMaximumContentLength" type="number">
-							<template #label>{{ i18n.ts._urlPreviewSetting.maximumContentLength }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewMaximumContentLength" class="_modified">{{ i18n.ts.modified }}</span></template>
-							<template #caption>{{ i18n.ts._urlPreviewSetting.maximumContentLengthDescription }}</template>
-						</MkInput>
-
-						<MkInput v-model="urlPreviewForm.state.urlPreviewTimeout" type="number">
-							<template #label>{{ i18n.ts._urlPreviewSetting.timeout }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewTimeout" class="_modified">{{ i18n.ts.modified }}</span></template>
-							<template #caption>{{ i18n.ts._urlPreviewSetting.timeoutDescription }}</template>
-						</MkInput>
-
-						<MkInput v-model="urlPreviewForm.state.urlPreviewUserAgent" type="text">
-							<template #label>{{ i18n.ts._urlPreviewSetting.userAgent }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewUserAgent" class="_modified">{{ i18n.ts.modified }}</span></template>
-							<template #caption>{{ i18n.ts._urlPreviewSetting.userAgentDescription }}</template>
-						</MkInput>
-
-						<div>
-							<MkInput v-model="urlPreviewForm.state.urlPreviewSummaryProxyUrl" type="text">
-								<template #label>{{ i18n.ts._urlPreviewSetting.summaryProxy }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewSummaryProxyUrl" class="_modified">{{ i18n.ts.modified }}</span></template>
-								<template #caption>[{{ i18n.ts.notUsePleaseLeaveBlank }}] {{ i18n.ts._urlPreviewSetting.summaryProxyDescription }}</template>
+							<MkInput v-model="urlPreviewForm.state.urlPreviewMaximumContentLength" type="number">
+								<template #label>{{ i18n.ts._urlPreviewSetting.maximumContentLength }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewMaximumContentLength" class="_modified">{{ i18n.ts.modified }}</span></template>
+								<template #caption>{{ i18n.ts._urlPreviewSetting.maximumContentLengthDescription }}</template>
 							</MkInput>
 
-							<div :class="$style.subCaption">
-								{{ i18n.ts._urlPreviewSetting.summaryProxyDescription2 }}
-								<ul style="padding-left: 20px; margin: 4px 0">
-									<li>{{ i18n.ts._urlPreviewSetting.timeout }} / key:timeout</li>
-									<li>{{ i18n.ts._urlPreviewSetting.maximumContentLength }} / key:contentLengthLimit</li>
-									<li>{{ i18n.ts._urlPreviewSetting.requireContentLength }} / key:contentLengthRequired</li>
-									<li>{{ i18n.ts._urlPreviewSetting.userAgent }} / key:userAgent</li>
-								</ul>
+							<MkInput v-model="urlPreviewForm.state.urlPreviewTimeout" type="number">
+								<template #label>{{ i18n.ts._urlPreviewSetting.timeout }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewTimeout" class="_modified">{{ i18n.ts.modified }}</span></template>
+								<template #caption>{{ i18n.ts._urlPreviewSetting.timeoutDescription }}</template>
+							</MkInput>
+
+							<MkInput v-model="urlPreviewForm.state.urlPreviewUserAgent" type="text">
+								<template #label>{{ i18n.ts._urlPreviewSetting.userAgent }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewUserAgent" class="_modified">{{ i18n.ts.modified }}</span></template>
+								<template #caption>{{ i18n.ts._urlPreviewSetting.userAgentDescription }}</template>
+							</MkInput>
+
+							<div>
+								<MkInput v-model="urlPreviewForm.state.urlPreviewSummaryProxyUrl" type="text">
+									<template #label>{{ i18n.ts._urlPreviewSetting.summaryProxy }}<span v-if="urlPreviewForm.modifiedStates.urlPreviewSummaryProxyUrl" class="_modified">{{ i18n.ts.modified }}</span></template>
+									<template #caption>[{{ i18n.ts.notUsePleaseLeaveBlank }}] {{ i18n.ts._urlPreviewSetting.summaryProxyDescription }}</template>
+								</MkInput>
+
+								<div :class="$style.subCaption">
+									{{ i18n.ts._urlPreviewSetting.summaryProxyDescription2 }}
+									<ul style="padding-left: 20px; margin: 4px 0">
+										<li>{{ i18n.ts._urlPreviewSetting.timeout }} / key:timeout</li>
+										<li>{{ i18n.ts._urlPreviewSetting.maximumContentLength }} / key:contentLengthLimit</li>
+										<li>{{ i18n.ts._urlPreviewSetting.requireContentLength }} / key:contentLengthRequired</li>
+										<li>{{ i18n.ts._urlPreviewSetting.userAgent }} / key:userAgent</li>
+									</ul>
+								</div>
 							</div>
-						</div>
+						</template>
 					</div>
 				</MkFolder>
 
@@ -230,7 +232,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { ref, computed } from 'vue';
-import * as Misskey from 'misskey-js';
 import XHeader from './_header_.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkInput from '@/components/MkInput.vue';
@@ -244,7 +245,6 @@ import { i18n } from '@/i18n.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import MkButton from '@/components/MkButton.vue';
 import MkFolder from '@/components/MkFolder.vue';
-import MkSelect from '@/components/MkSelect.vue';
 import MkKeyValue from '@/components/MkKeyValue.vue';
 import { useForm } from '@/scripts/use-form.js';
 import MkFormFooter from '@/components/MkFormFooter.vue';