I initially thought Object Desktop (between Fences, Groupy, and Start10/11) would've had this feature but I did not see it in any of their settings so I would like to request Stardock implement a polished version of this GitHub taskbar feature in their Start11/10 product:
tjackenpacken/taskbar-groups: Lightweight utility for organizing the taskbar through groups (github.com)
The GitHub project is great but it is a bit clunky and has some issues at times. I feel Stardock could implement this feature well into the new taskbar they rebuilt.
This feature essentially allows you to cluster unrelated applications taskbar launcher icons into groups. So you would make a group labeled "Work" and inside of it you would have like "Word, Excel, Zoom, etc." then you could have a "Gaming" group where it holds all your launcher icons like "Xbox, Steam, Ubisoft, RPCS3, etc" and this really frees up space on the taskbar if you have a lot of pinned icons. Each group could be given a custom icon to represent the group as well as the GitHub project does.
I hope this gets implemented at some point as I would appreciate it a ton. Having everything integrated into Start11 would be awesome and I know the Stardock team could make it look slick! Thanks for your time.