Hello, I'm having the same issue here with my Macbook Air M1, I have two 2K Dell monitors connected and since the MBA M1 only supports one display, I have to connect the second via a Dock that supports DisplayLink, I'm using the Dell D6000
If the monitor is connected to usb-c, BetterDisplay allows me to activate the High Resolution (HiDPI) option but not when the monitor is connected to the Dock
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