Please have the pop up windows stay persistent for browsing things like performances.
+1000.
Please implement this. I would love to be able to quickly preview different performance options without the window closing after every selection.
You can do that! Just click and hold the Motion and it will preview without selecting it!
Ah man, that’s actually even better! 
The popup windows have an x button to close. I would like them to stay open until closed. This way i could lay down an arrangement/progression and then scroll through the passages without the window closing.
Yeah the issue we had with that is that our users couldn’t figure out it was a double tap to select the motion! This way feels safer but looks like we have caused other confusion (not knowing that you can click and hold to preview). Let me discuss with the team or interested to hear everyone’s thoughts.
I must admit, now that I’m aware, I like how tap&hold preview browsing performances works. I wish there was a toggle that allowed them to be looped. Bonus if they could be looped in sync with arrangement (this would make closing the window after selection efficient vs obstructive).
Knowing is half the battle. I use Scaler often and felt this area was cumbersome before realizing tap/hold. It’s pretty sweet. However, im also very much here for @Lucid suggestion because if im understanding correctly; it would be the only way to properly audition performances in time without leaving the list (unless you add looped/sync to current behavior as described above).