The render gui does not account for the double-resolution of retina Macs, resulting in a cropped GUI in the bottom left corner 1/4th the size of the game window.

Please fix that! it's so annoying to restart minecraft always after rendering something...

Hmm. For a few months now, Minecraft automatically switches to full screen when I start it (it came suddenly).
For some reason I can't make the window any smaller either, as this menubar doesn't come down from the top when I move my cursor up.

(Mac with m1 Chip)

@Kloetzchengrafikk umm.. just resize the window after you manage to click the done button when it's done rendering. does not require a restart of the game to operate correctly again after rendering.