There are many minimal, tiling window managers which solve this problem. I think they are all mainly for linux - I imagine it’s probably pretty hacky to do a window manager for windows.
My favorite is xmonad, which is multi-screen aware, and weighs in at about 500 lines of haskell for the quite functional core. (there’s also test code and ~2000 lines of extensions). I’ve been using it for about a month and loving it. The minimalism only really matters for you if you know haskell - it’s very easy to comprehend the entire thing, and as such very easy to extend and customize.