@Kevin_Z Disabling Smart Connect solved the problem, thanks. I think I previously had Smart Connect enabled before I upgraded the firmware and was still able to modify those settings.

I upgraded to firmware 1.2.0 Build 20211222 rel.74632(5553) and now I can't disable 2.4ghz. This is what I see now: According to the user guide I should be able to disable 2.4ghz: Before I upgraded...