In a new support document, Apple has acknowledged that when connecting an external ultrawide or super ultrawide display to a Mac with an M1 chip, some resolutions supported by the display are currently unavailable.
Apple stated in the new support document that the company is aware of the issue and plans to provide a fix in a future macOS update.
M1 Mac: Solution could be added in macOS 11.2
If the supported resolution is not available on an ultrawide or super-ultrawide external display connected to your Mac with Apple M1 chip.
When you connect an ultrawide or super-ultrawide monitor to your Mac with Apple M1 chip, some resolutions supported by your display may be unavailable. Apple is aware of this issue and a fix is planned for a future macOS update.
However, the company did not give a specific time frame. The first beta of macOS 11.2 was released last week. The solution may be added during the beta phase. Alternatively, a separate update would be possible. (Image: Apple)