diff --git a/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs b/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
index 604e2077..63759525 100644
--- a/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
+++ b/v2rayN/v2rayN.Desktop/ViewModels/ThemeSettingViewModel.cs
@@ -31,6 +31,7 @@ namespace v2rayN.Desktop.ViewModels
         {
             ModifyTheme();
             ModifyFontFamily();
+            ModifyFontSize();
         }
 
         private void BindingUI()
@@ -67,11 +68,10 @@ namespace v2rayN.Desktop.ViewModels
                     y => y > 0)
                 .Subscribe(c =>
                 {
-                    if (CurrentFontSize >= Global.MinFontSize)
+                    if (_config.UiItem.CurrentFontSize != CurrentFontSize && CurrentFontSize >= Global.MinFontSize)
                     {
                         _config.UiItem.CurrentFontSize = CurrentFontSize;
-                        double size = CurrentFontSize;
-                        ModifyFontSize(size);
+                        ModifyFontSize();
                         ConfigHandler.SaveConfig(_config);
                     }
                 });
@@ -100,8 +100,9 @@ namespace v2rayN.Desktop.ViewModels
             }
         }
 
-        private void ModifyFontSize(double size)
+        private void ModifyFontSize()
         {
+            double size = CurrentFontSize;
             Style style = new(x => Selectors.Or(
                 x.OfType<Button>(),
                 x.OfType<TextBox>(),
diff --git a/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs b/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
index 2970c1d9..bffad088 100644
--- a/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/ThemeSettingViewModel.cs
@@ -47,6 +47,7 @@ namespace v2rayN.ViewModels
         private void RestoreUI()
         {
             ModifyTheme();
+            ModifyFontSize();
             if (!_config.UiItem.ColorPrimaryName.IsNullOrEmpty())
             {
                 var swatch = new SwatchesProvider().Swatches.FirstOrDefault(t => t.Name == _config.UiItem.ColorPrimaryName);
@@ -121,14 +122,10 @@ namespace v2rayN.ViewModels
                y => y > 0)
                   .Subscribe(c =>
                   {
-                      if (CurrentFontSize >= Global.MinFontSize)
+                      if (_config.UiItem.CurrentFontSize != CurrentFontSize && CurrentFontSize >= Global.MinFontSize)
                       {
                           _config.UiItem.CurrentFontSize = CurrentFontSize;
-                          double size = (long)CurrentFontSize;
-                          Application.Current.Resources["StdFontSize"] = size;
-                          Application.Current.Resources["StdFontSize1"] = size + 1;
-                          Application.Current.Resources["StdFontSize-1"] = size - 1;
-
+                          ModifyFontSize();
                           ConfigHandler.SaveConfig(_config);
                       }
                   });
@@ -158,6 +155,14 @@ namespace v2rayN.ViewModels
             WindowsUtils.SetDarkBorder(Application.Current.MainWindow, isDarkTheme);
         }
 
+        private void ModifyFontSize()
+        {
+            double size = (long)CurrentFontSize;
+            Application.Current.Resources["StdFontSize"] = size;
+            Application.Current.Resources["StdFontSize1"] = size + 1;
+            Application.Current.Resources["StdFontSize-1"] = size - 1;
+        }
+
         public void ChangePrimaryColor(System.Windows.Media.Color color)
         {
             var theme = _paletteHelper.GetTheme();