diff --git a/v2rayN/v2rayN/Views/MainWindow.xaml.cs b/v2rayN/v2rayN/Views/MainWindow.xaml.cs
index 9ff4bea0..b7ea9afb 100644
--- a/v2rayN/v2rayN/Views/MainWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/MainWindow.xaml.cs
@@ -36,6 +36,8 @@ namespace v2rayN.Views
                 this.Height = SystemParameters.WorkArea.Height;
             }
 
+            lstGroup.MaxHeight = Math.Floor(SystemParameters.WorkArea.Height * 0.20 / 40) * 40;
+
             _config = LazyConfig.Instance.GetConfig();
 
             App.Current.SessionEnding += Current_SessionEnding;