Hi Henry,
Thank you for using Syncfusion products.
We can make the auto hidden tabs larger by setting MinHeight in DockingManager.SideItemStyle property. Please feel free to update us about the issues you are facing. We have prepared a sample for the same kindly download it from the following link,
Sample:
AutoHide_TabSize.zipPlease let us know whether the provided sample meets your requirement or not.
Regards,
Jessie