Not sure what's happening here, but as you can see I have no problems on my MBP M1 Max. Why are you still using MacOS 12.4? The latest version is 12.5.1 and this version is stronlgy recommended because it fixes some major security issues.
To build on Johan's reply, I don't see those symptoms in dark mode on LR 11.5 / Mac OS 12.4 or 12.5.1 / Macbook M1 Pro or on LR 11.5 / Mac OS 12.4 / Macbook Pro Intel. Troubleshooting steps to identify a fix / workaround:
1. If you haven't already, reboot the computer.
2. Update to Mac OS 12.5.1.
3. If it's only the right column (settings) of the Export window that's glitching, and if you're using an Export preset, try making a new preset from scratch. Sometimes LR chokes on existing presets for unknown reasons.