diff --git a/packages/client/src/pages/settings/theme.vue b/packages/client/src/pages/settings/theme.vue
index 201a7fa8e9..b724c4c0c1 100644
--- a/packages/client/src/pages/settings/theme.vue
+++ b/packages/client/src/pages/settings/theme.vue
@@ -30,21 +30,23 @@
 		<FormSelect v-model="lightThemeId" large class="select">
 			<template #label>{{ i18n.ts.themeForLightMode }}</template>
 			<template #prefix><i class="fas fa-sun"></i></template>
-			<optgroup :label="i18n.ts.lightThemes">
-				<option v-for="x in lightThemes" :key="x.id" :value="x.id">{{ x.name }}</option>
+			<option v-if="instanceLightTheme" :key="'instance:' + instanceLightTheme.id" :value="instanceLightTheme.id">{{ instanceLightTheme.name }}</option>
+			<optgroup v-if="installedLightThemes.length > 0" :label="i18n.ts._theme.installedThemes">
+				<option v-for="x in installedLightThemes" :key="'installed:' + x.id" :value="x.id">{{ x.name }}</option>
 			</optgroup>
-			<optgroup :label="i18n.ts.darkThemes">
-				<option v-for="x in darkThemes" :key="x.id" :value="x.id">{{ x.name }}</option>
+			<optgroup :label="i18n.ts._theme.builtinThemes">
+				<option v-for="x in builtinLightThemes" :key="'builtin:' + x.id" :value="x.id">{{ x.name }}</option>
 			</optgroup>
 		</FormSelect>
 		<FormSelect v-model="darkThemeId" large class="select">
 			<template #label>{{ i18n.ts.themeForDarkMode }}</template>
 			<template #prefix><i class="fas fa-moon"></i></template>
-			<optgroup :label="i18n.ts.darkThemes">
-				<option v-for="x in darkThemes" :key="x.id" :value="x.id">{{ x.name }}</option>
+			<option v-if="instanceDarkTheme" :key="'instance:' + instanceDarkTheme.id" :value="instanceDarkTheme.id">{{ instanceDarkTheme.name }}</option>
+			<optgroup v-if="installedDarkThemes.length > 0" :label="i18n.ts._theme.installedThemes">
+				<option v-for="x in installedDarkThemes" :key="'installed:' + x.id" :value="x.id">{{ x.name }}</option>
 			</optgroup>
-			<optgroup :label="i18n.ts.lightThemes">
-				<option v-for="x in lightThemes" :key="x.id" :value="x.id">{{ x.name }}</option>
+			<optgroup :label="i18n.ts._theme.builtinThemes">
+				<option v-for="x in builtinDarkThemes" :key="'builtin:' + x.id" :value="x.id">{{ x.name }}</option>
 			</optgroup>
 		</FormSelect>
 	</div>
@@ -83,14 +85,15 @@ import { definePageMetadata } from '@/scripts/page-metadata';
 
 const installedThemes = ref(getThemes());
 const builtinThemes = getBuiltinThemesRef();
-const instanceThemes = [];
 
-if (instance.defaultLightTheme != null) instanceThemes.push(JSON5.parse(instance.defaultLightTheme));
-if (instance.defaultDarkTheme != null) instanceThemes.push(JSON5.parse(instance.defaultDarkTheme));
+const instanceDarkTheme = computed(() => instance.defaultDarkTheme ? JSON5.parse(instance.defaultDarkTheme) : null);
+const installedDarkThemes = computed(() => installedThemes.value.filter(t => t.base === 'dark' || t.kind === 'dark'));
+const builtinDarkThemes = computed(() => builtinThemes.value.filter(t => t.base === 'dark' || t.kind === 'dark'));
+const instanceLightTheme = computed(() => instance.defaultLightTheme ? JSON5.parse(instance.defaultLightTheme) : null);
+const installedLightThemes = computed(() => installedThemes.value.filter(t => t.base === 'light' || t.kind === 'light'));
+const builtinLightThemes = computed(() => builtinThemes.value.filter(t => t.base === 'light' || t.kind === 'light'));
+const themes = computed(() => uniqueBy([ instanceDarkTheme.value, instanceLightTheme.value, ...builtinThemes.value, ...installedThemes.value ].filter(x => x != null), theme => theme.id));
 
-const themes = computed(() => uniqueBy([ ...instanceThemes, ...builtinThemes.value, ...installedThemes.value ], theme => theme.id));
-const darkThemes = computed(() => themes.value.filter(t => t.base === 'dark' || t.kind === 'dark'));
-const lightThemes = computed(() => themes.value.filter(t => t.base === 'light' || t.kind === 'light'));
 const darkTheme = ColdDeviceStorage.ref('darkTheme');
 const darkThemeId = computed({
 	get() {