If you drudged through the following thread, you’d see an issue with Windows 10 updates and how at least one update can mess with graphic settings: reverting settings for some.
What gave you got the message about using the Intel graphics over the Quadro? Ub SU, you can check your graphics through Window > Preferences > OpenGL > Graphics Card Details. Is that your source?
That GPU utilization chart is for your Nvidia card - which you report is not being used with SU. That just shows the Quadro isn’t being used.
It sounds like time to contact Nvidia support on why you cannot access the 3D settings page. It maybe a permission thing - the way the driver was installed. Did you r-click > Run as administrator?