Hello everyone! The same issue with Apple thunderbolt display, either small interface or blurry text on my m1. Really surprising... Apple made it possible to enable HiDpi on 4k+ displays only, irrespectively to display vendor. If someone told me about it before I buy macbook on Big Sur, I would certainly change my mind. This is for all us to understand: it's not a bug, but a planned marketing feature and noone in going to fix it. Sad, but true.