I would like to upvote this feature.
I'm using ultra-wide screen with resolution of 3440x1440.
Having the possibility to split groupy window into 2 panes with separate collection of tabs and a vertical splitter between them would be awesome.
Right now I'm using PowerToys FancyZones to organize the screen, but I'm missing the splitter functionality.
What I mean is a limited functionality of what AquaSnap + TidyTabs do.