Did you install SU by right click on the install file and choose Run as Administrator?
Try turning off MacAfee av.
Do you have SU set to use the RTX in Nvidia properties?
If taken at face value, such a graphics card doesn’t exist (mixing Nvidia and AMD product names). However, the models I found had all Nvidia graphics.
Have you upgraded your Nvidia driver?
Are you using plugins?
I did not run install as Administrator. I have now uninstalled and reinstalled as Administrator. Also running as Administrator. I have since confirmed that Sketchup is using the GeForce RTX 2060 graphics card. I have now exempted Sketchup from McAfee Firewall. Also turned off McAfee temporarily.
You shouldn’t really be running as admin, it can mess with things like drag and drop files. Installing as admin is important, then run as normal user. Being an admin is fine but don’t specifically choose to run sketchup as admin.