As a developer we make games which are just for hit and trial purposes and various other reasons which crowds the studio’s “recent games” or “my games” folders.
Currently Roblox has provided no way whatsoever to organize this. The best you can do is click the three dots, and click Archive. This won’t delete the place, but will just make it private and put it in the Archive tab.
You can always archive your games to make them only appear in the Archive section. This would certainly help when scrolling through studio. All you need to do is press the three dots when you over your mouse over the certain game and then you click it and then click Archive