It happens to me various times a day that I edit a custom class and after clicking done my immediate thought is to hit the V key to preview the effects, but of course that doesn’t happen because the cursor is still in the Classes window so I end up typing v instead. Then after a moment of frustration and bewilderment I delete the v, click out of the window and then try again.
I’m not sure how this could be solved but it sure would be nice if that cursor key automatically exited the Classes window after editing a custom class or even just switched automatically to preview. If you edit with Solis open at the same time you can generally see custom class edits in real time, but it’s just one of those workflow gremlins in Blocs that would be nice to avoid.