Blender is using Workbench to render default preview, which I don’t really like.
For that reason I created addon which will render selected objects in asset browser in 200x200 format and save them all to .blend file location under /thumbnails/{collection_name}/
Download it from my GruntWorks github.
Here is before and after preview:
Workbench default thumbnails:
Addon trigger:
Updated:
