I know this is a month old, but if you just shove the tabs around enough on the right side of the play area, you can eventually get them to go side by side, then you can save the match layout for your future use. (It looks really bad for 1-vs-1, but you can switch back and forth once you've saved it).

- Here's what it looks like once you get it.
I'm on the Mac version, so I don't know if my file format is the same as yours (my layouts are saved as XML files), and I can't upload XML files here. I've attached the contents of my XML file saved in a text editor, but I don't know if that will be useful.