Apple recognized the problems experienced when using a Mac M1 with ultra- or super-long external displays.
The M1 Macs do not seem to recognize the native resolution of these monitors …
Macworld saw an extremely brief support document.
If the supported resolution is not available on an external ultra-wide or super-lateral screen connected to your Mac with Apple M1 chip
If you connect an ultra or super ultra large monitor to your Mac with an Apple M1 chip, some resolutions supported by your monitor may not be available.
Apple is aware of this problem and the resolution is planned for a future update of macOS.
To see additional resolutions for your external monitor, choose Apple menu > System Preferences, click Monitors and hold down the Option key while clicking Scaled.
The final line suggests, but does not promise, that you can enable a more appropriate resolution using the scaling options, but it is not clear whether this can include the native resolution.
One of our readers found a solution to your problem:
Personally, I am a big fan of super ultra wide displays, which ended up with the 49 inch Dell UltraSharp.
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