How to change DPI?
HiDPI options are normally only seen on HiDPI monitors. Are you sure that your Aorus monitor is a HiDPI display? From what I can find on the internet, it's a 2560 x 1440 27 inch display.
That said, the resolution options are a bit strange: there is no 2560 x 1440 option for example.
You can sometimes get more resolution options by holding Alt (option) when clicking on the Scaled radio box.