I started reconsidering Edge literally last week because Panorama View managed to lose my groups again, and Edge has excellent workspaces (envy).
Haven't tried the new groups yet, but from the video it is unclear what to do if I don't want them to constantly stay visible in the tab bar. The whole point for me is decluttering it from something I don't need at the moment.
If you click the little < left-scroll arrow on the left of your tab bar a few hundred times you'll eventually get to the start of your tab group. Then there will be a box [ ] that you can click. That will toggle visibility of the tab group, so all the tabs in it will be hidden. Click the box again to expand the group.
Haven't tried the new groups yet, but from the video it is unclear what to do if I don't want them to constantly stay visible in the tab bar. The whole point for me is decluttering it from something I don't need at the moment.