Thank you for contacting Syncfusion Support.Query#1
:"Is there a way to customize the group bar context menu?"
We have prepared a sample for customizing GroupBar context menu. In this sample, we have removed the default context menu items and added two new context menu items.Query#2:"can you disable drag/drop in the groupbar?"
In our GroupBar control, we can disable the DragDrop by using the property "AllowDragandDrop". On disabling this property for GroupBar and GroupView, we cannot drag the items. We have created sample by disabling this property.
Please download the sample from below.