I need some help, please. 2012-13 MacBook Pro, 10.13.6.
Until yesterday I could have two or more apps open at once and visible on the screen. ie Mail , an invoice and Firefox, open at my bank. Clicking on one or the other placed it on top. Either could be dragged aside to show more of the other and the stack rearranged in any order, with a bit of each visible for clicking on.
Now opening a second window cancels the one currently open, or rather hides it until I click on its App icon in the dock. I can’t view both simultaneously.
Apparently I’m not asking Google the right questions. All I can get are articles on how to use split screen. I don’t want split screen.
I’ve obviously unintentionally changed something, but what?
Some help would be appreciated.I’ve already spent enough time trying to fix it.