"When you first update Blender and have BlenderKit installled, The BlenderKit Asset bar may become persistent and use up a big chunk of your 3D View Port.

If it loads every time you start Blender and want to turn it off, find the BlenderKit Addon options and uncheck "Show assetbar when starting Blender". Close Blender and relaunch. The Asset Bar should not load.

If you find that the asset bar is persistent, this is another way to turn it off and on...

https://steamcommunity.com/sharedfiles/filedetails/?id=2119038162"