Test build for #12: open on hover with Start11 or StartAllBack.
The hover watcher chose how to read the taskbar from the version of Windows, so on Windows 11 it always looked for the buttons of the standard taskbar, where each pinned group carries an ID of ours. StartAllBack brings the Windows 10 taskbar back, whose buttons come through another way, and Start11 draws its taskbar with its own code, so no group was ever found on either of them.
Now the taskbar is read the way it is drawn on screen. A window kept along the edge of the screen like a taskbar is read as one too, and when no button carries a group's ID, the groups are found by the name of their pinned shortcut. Nothing changes on the standard taskbar of Windows 10 or 11.
This is a pre-release, so the app does not offer it as an update. To try it, run TaskbarGroupsFluent-Setup.exe over the version you have: your groups and settings stay as they are. Once it is confirmed to work, it becomes 1.8.1 for everyone.