Based on the provided picture, the issue with the Visual Style Builder’s designer surface is often caused by a corrupted or outdated layout file. This can happen after updating or reinstalling the product, especially if the layout file contains settings from a previous version.
How to resolve the blank designer surface:
Close Visual Style Builder.
Go to the following folder (replace <your user name> with your Windows username): C:\Users\<your user name>\AppData\Roaming\Telerik\WinForms\VSB