Just tested the new release.
The new palette looks nice!

I'm confused, however, regarding the purpose of the custom group feature. Why is there a difference between User Integrated Tools and custom groups? And how to insert tools into these groups? I'm not able to drag'n'drop components between the trees (which would require several configuration.jsons to be modified in concert).

The dialog title states Manage ... Group assignments and Reset components to their default groups.

I assume this addition is just a preparation for a later feature not available yet? I couldn't find details in the documentation (btw - the screenshots still show the old palette).