SyncTERM 1.2 on MacOS 14.5 (Apple Silicon/ARM) - SDL display issues

I downloaded a recent build artifact of SyncTERM for Mac. This is for Darwin x86 but there was no ARM option (perhaps another issue requesting that?).

It starts fine and all functionality appears to be as expected, however the SDL output is only in the top left corner of the display window. Please see attached photo.

Please let me know how to troubleshoot! Separately, if there are simplified build instructions, I wouldn't mind building from scratch for Apple Silicon. Thanks.