M1 macs tend to have issues with custom resolutions. Notoriously they don't allow sub-4K resolution displays to have HiDPI ("Retina") resolutions even though (for example) a 24" QHD 1440p display would greatly benefit from having an 1920x1080 HiDPI "Retina" mode.
To fix this issue, some resort to buying a 4K HDMI dummy dongle to fool macOS into thinking that a 4K display is connected and then mirror the contents of this dummy display to their actual monitor in order to have HiDPI resolutions available. Others use the built in screens of their MacBooks to mirror to the external display. These approaches have obvious drawbacks and cannot solve all problems.
According Mojo Vision, with a world record pixel pitch of 1.8µm and a pixel density over 14,000ppi, the monochrome display technology is the company’s first important step in succeeding in its mission to deliver “Invisible Computing”, enabling people to receive and share information that is immediate and relevant without distracting them from the world in front of them.