I'm using Xcode 13, but the problem has happened since at least Xcode 11. I prefer a three-editor layout. Each editor equal width. This is easy to achieve: close all but one editor, then click the 'Add Editor' button twice. Each window is equal width. But EVERY time I close and relaunch my project, the editor windows resize. The middle editor will be 2/3 the size of the editor space, the editor on the left will be about 1/5th the width and the editor on the right will be a tiny sliver. So every time I open the project I have to close the editors, then re-add two editor windows to get them to equal size. Is there ANY way to have Xcode actually save the window and editor layouts between launches?

Is there any way to test async/await and actors on macOS 11? Some sort of runtime toolchain I can install on my dev machine? I've ported some code and would love to test it without upgrading my only dev machine to macOS 12 yet. Thanks! 🙏