When working on one of the newer Mac M1 models, your I/O options for displays are limited to USB-C on the laptops and USB-C or HDMI on the Mac Mini. If you are working with an AQCOLOR monitor with USB-C connectivity or Thunderbolt 3, you only need to plug it directly into one of the ports on your Mac using the supplied cable. For other models without USB-C, you can choose to use HDMI with the Mac Mini or rely on the fact that USB-C on the Mac can carry DisplayPort signals. Since USB-C to DisplayPort cables are passive, meaning they don't require additional circuitry, they are an affordable and discreet way to plug your DisplayPort AQCOLOR monitor into your Mac, no dongles required.
Once connected, your monitor should work flawlessly. Of course, you can always go into the System Preferences of your Mac to adjust the scaling level to your preference. The Mac will automatically detect the correct resolution and refresh rate.
Since the early days of the M1 Mac, complaints about 4K monitors limited to 30Hz and other issues with multiple monitors have been frequent in support forums. However, these bugs need to be addressed by Apple in a subsequent OS update.