I have reported the issues with the resolution to the team so they can look into this!

In the meantime, try browsing to the '~/Documents/Larian Studios/Baldur's Gate 3' folder and delete or rename the graphicSettings.lsx file, to get the game to recreate it the next time it is started, to see if that helps.

If the issue persists, please contact our support team! https://larian.com/support/baldur-s-gate-3#modal