[latexr]

> Windows lets you half-width maximize windows next to each other, then drag the border in between to resize both

So does macOS[1] (and iPadOS).

[1]: https://support.apple.com/en-us/HT204948

[falcolas]

FWIW, that's full screen mode only. I can't do that on option-Plus button sized screens.

You lose the menu bar and dock to full screen mode (they're hidden, more specifically).