I love the “save tab group” feature! I use one group per project and since I can hide the group, it doesn’t clutter up the tab bar. The saved tab group items in the bookmarks bar also give me a nice overview of the projects that I am actively working on. The problem arises when I finish a project (yes, such things happen!).
When I finish a project, I like to archive its associated tab group. It could be as simple as dragging the tab group icon onto the regular bookmarks bar:
Right now this is not possible, however, and I’d like to request this feature.