diff --git a/src/lib/components/chat/SettingsModal.svelte b/src/lib/components/chat/SettingsModal.svelte
index 53979264bf..2b88850ea4 100644
--- a/src/lib/components/chat/SettingsModal.svelte
+++ b/src/lib/components/chat/SettingsModal.svelte
@@ -63,6 +63,23 @@
 	let tabState: Record<string, unknown> | null = null;
 	let personalUiSettings: Record<string, any> = {};
 
+	const mergeUiSettings = (defaults: Record<string, any>, userSettings: Record<string, any>) => {
+		const merged = { ...defaults };
+		for (const [key, value] of Object.entries(userSettings)) {
+			const defaultValue = merged[key];
+			merged[key] =
+				defaultValue &&
+				value &&
+				typeof defaultValue === 'object' &&
+				typeof value === 'object' &&
+				!Array.isArray(defaultValue) &&
+				!Array.isArray(value)
+					? mergeUiSettings(defaultValue, value)
+					: value;
+		}
+		return merged;
+	};
+
 	const loadPersonalUiSettings = async () => {
 		const userSettings = await getUserSettings(localStorage.token, true).catch((error) => {
 			console.error(error);
@@ -838,6 +855,9 @@
 		const saved = await updateUserSettings(localStorage.token, { ui: $settings });
 		personalUiSettings =
 			saved?.ui && typeof saved.ui === 'object' && !Array.isArray(saved.ui) ? saved.ui : {};
+		await settings.set(
+			mergeUiSettings($config?.ui?.default_interface_settings ?? {}, personalUiSettings)
+		);
 	};
 
 	const getModels = async () => {
diff --git a/src/lib/components/common/InterfaceSettings.svelte b/src/lib/components/common/InterfaceSettings.svelte
index dd198d47dc..c3295607ae 100644
--- a/src/lib/components/common/InterfaceSettings.svelte
+++ b/src/lib/components/common/InterfaceSettings.svelte
@@ -111,6 +111,7 @@
 	let showManageImageCompressionModal = false;
 
 	let textScale: number | null = null;
+	let showTextScaleSlider = false;
 	const settingRowClass = 'flex items-center justify-between gap-2.5';
 	const settingLabelClass = 'min-w-0 text-xs text-gray-600 dark:text-gray-400';
 	const settingControlClass = 'flex shrink-0 items-center justify-end gap-1.5';
@@ -243,9 +244,6 @@
 			setTextScale(textScale);
 		}
 
-		if (textScale === 1) {
-			textScale = null;
-		}
 		saveSettings({ textScale });
 	};
 
@@ -328,6 +326,7 @@
 		webSearch = currentSettings?.webSearch ?? null;
 
 		textScale = currentSettings?.textScale ?? null;
+		showTextScaleSlider = false;
 
 		defaultUploadContext = currentSettings?.defaultUploadContext ?? 'focused';
 	};
@@ -401,14 +400,20 @@
 							aria-live="polite"
 							type="button"
 							on:click={() => {
-								if (textScale === null) {
-									textScale = 1;
-								} else if (!isDefaultSetting('textScale')) {
-									setTextScaleHandler(defaultSettings.textScale ?? 1);
+								if (textScale === null || (isDefaultSetting('textScale') && !showTextScaleSlider)) {
+									textScale = textScale ?? defaultSettings.textScale ?? 1;
+									showTextScaleSlider = true;
+								} else {
+									showTextScaleSlider = false;
+									if (!externalSettings) {
+										setTextScale(defaultSettings.textScale ?? 1);
+									}
+									textScale = null;
+									saveSettings({ textScale });
 								}
 							}}
 						>
-							{#if textScale === null || isDefaultSetting('textScale')}
+							{#if textScale === null || (isDefaultSetting('textScale') && !showTextScaleSlider)}
 								<span>{$i18n.t('Default')}</span>
 							{:else}
 								<span>{textScale}x</span>
@@ -417,7 +422,7 @@
 					</div>
 				</div>
 
-				{#if textScale !== null && !isDefaultSetting('textScale')}
+				{#if textScale !== null && (showTextScaleSlider || !isDefaultSetting('textScale'))}
 					<div class=" flex items-center gap-2 px-1 pb-1">
 						<button
 							type="button"