I would like to echo the sentiment in these forum posts:
Feature Request: Tiling Windows within a Group » Forum Post by ss48 (stardock.com)
Feature Request » Forum Post by e1m5 (stardock.com)
Grouping applications so that I can gather all relevant windows pertaining to one particular task in a single parent window is great, but the way this is done in Groupy right now essentially sacrifices multitasking. The user should be able to lay out windows within the group in a customizable, accessible way that facilitates multitasking and productivity, rather than having to click-click-click on tabs. So, the ability to tile the windows within a group is something I sorely miss. To take this one step further, the ideal for me would be an implementation of customizable window layouts within the group (say, a la FancyZones from MS PowerToys).
The pasted posts above are one year apart I think, both forwarded to the development team, but nothing further. So, any chance?