Just to confirm:
- are you on the latest version of MacOS?
- do you have any add-ons installed?
You can try the latest beta (both Qt5 and Qt6 versions).
In another thread a user suggested that opening Anki with a flag to disable the gpu helped them. To try that, open the terminal app, paste the following, and hit enter:
/Applications/Anki.app/Contents/MacOS/anki --disable-gpu
If that doesn’t work, the output from the terminal might give a clue, so paste it here.