SO I have a 2nd PC with the monitor stood up portrait to save space, now other pinball games like PFX and the new version of Pro Pinball are fine but I keep getting error messages about non-flip and cant run in this resolution.

Is there a setting somewhere I can change?

in some windowed modes a method might be instead of 640x480 try 480x640

also on Linux for whatever reason the Displays I have rotated or flipped up sidedown the default setting on this seems to be 90.

For Windows 11 found a display orientation option but it is greyed out. WindowsKey+I to get to Display. May need to be administrator. One site said Ctrl+Alt+ Arrow Keys