I'm a recent convert to new versions of the MacOS, last version I was using was Yosemite or something like that (will check). In this version, Tahoe, it's entirely too easy to make a window go full screen with no obvious keystroke to undo the mistake. I learned if you move the mouse up to the top of the screen you get the menubar, but unfortunately there is no obvious command in the menu for undoing the mistake. I still don't know which gesture does this. And btw, the longtime Mac bug where some keystroke moves the dock to another window, that's still here. I can tell as I'm clicking the mouse, too late to stop, that this is one of those times. I've memorized a finger macro to get it back, but it used to piss me off a lot, but now it's kind of a gentle reassurance that someone is remembering how we got here. #