Info-Mac

I can't find the 'help' topic on this. I know it happens when I'm dragging windows about to see a lot at once and sometimes pull one too far to the right ... but how do you undo this this/get them back? (I know I should using 'spaces' etc. but haven't got around to it as I can never remember what I've allocated to what.) Anyway, this happens with two windows in one application, typically Preview or Word.

I suggest that you goto the Apple support site, and put your question to then, they generally have an answer to things like this

Hello macint!

Thanks for the suggestion. Hasn't been happening lately, must have been some bad habit I had
Good night!