Reminds me -- it used to be that I could plug my Macbook air into a monitor and arrange my windows, and it would return them to that position whenever I'd disconnect and come back. That feature vanished as of ~2018 and you have to buy some app to get it back.
My Macbook pro still does this. Granted, it's a little wonky. If you alter the window in any way while disconnected then it might not return to the original location. It also doesn't preserve any new desktop environments created on the external display.
