This is just a small usability enhancement.
All the actions in TestInsight take place near the top of the window (Select Tests/Start/Stop/Clear/Filter/...). Only the "group by ..." tab is at the bottom.
I have the TestInsight Explorer on one half of my secondary monitor and I turn different Test/Fixtures on/off many times during a day, also toggling between tabs. This change would save (at least me) a lot of mouse-meters every day. What do others think? Would this change make sense to you as well?