As a workaround, you can add a custom Margin and Padding to the MinimizedOutlookBarItems: <Style TargetType="outlookBarPrimitives:MinimizedOutlookBarItem"> <Setter Property="Padding" Value="5" /> <Setter Property="Margin" Value="2" /> </Style> Where xmlns:outlookBarPrimitives="clr-namespace:Telerik.Windows.Controls.OutlookBar;assembly=Telerik.Windows.Controls.Navigation".
Hi, The fix for the issue will be available in next LIB version (2018.3.924). It will also be included in our official version – R3 2018 SP1, scheduled for the mid of October, 2018. Best regards, Ralitsa Kumanova