Overall the patch 7 UI is a huge improvement, especially the hotbars.
I have, however run into a problem. I accidentally dragged the Hide action icon off the default hotbar (trackpad and unsteady hands.) It has now disappeared, and I can't figure out how to put it back. It's still on the bonus action hotbar, but I can't seem to move it back to the main hotbar (the one that shows actions, bonus actions, spells, items...)
For that matter, I see the 'custom' option for a hotbar, but can't figure out how to move any actions of bonus actions to that either.