It seems that CoreGraphics support is incomplete in Xamarin.Mac. Searching for CGDisplayModeGetRefreshRate in the github repo only gives me one hit:

https://github.com/xamarin/xamarin-macios/blob/main/tests/xtro-sharpie/macOS-CoreGraphics.ignore: !missing-pinvoke! CGDisplayModeGetRefreshRate is not bound

Background: I want to determine the screen refresh rate on MacOS via the Xamarin APIs. CoreGraphics has a function to accomplish that: CGDisplayModeGetRefreshRate. In Swift this is part of the class CGDisplayMode.