On Mac, ctrl-cmd-H is used to highlight text. But when I accidentally typed that sequence in Acrobat, it made both the "quick tool" floating menu AND the "All Tools" panel vanish. Since I didn't know what I'd done to make them vanish, I had no way to bring them back: there is no item anywhere in the Acrobat menu that allows that.

Fortunately restarting the Acrobat app makes the floating menu reappear. I finally worked out how I was making it vanish and realized that typing ctrl-cmd-H would bring it back. But there should be an option under View-Show/Hide to accomplish this.

There is also nothing in the online documentation describing this behavior or any method of hiding the floating menu. Documentation should be updated.