Hey! Thanks for the bug report, I really appreciate it! :D
I've fixed the Mac display issue and it will be ready to go in the next update. I'm hoping to upload in the next week or so and the new version will have additional user settings for resolution too. The Windows version is a few updates ahead at the moment so if you don't want to wait definitely feel free to give that one a play in the meantime.
Thanks so much again for your report, the extra details and screenshot are super helpful, I'll add a note to the mac build now too!