If anyone is still having trouble compiling Arduino sketches for the Round Display, here is one clear method I found to make sure the provided examples work. I believe that I ran into some library conflicts originally on my Windows PC. I am not sure how to delete some libraries from my Windows PC - may have to uninstall and re-install Arduino IDE. However, the simple test was using my RPi400 and created a completely new image and then install Arduino IDE. Then adding the required libraries for the Round Display as stated in the wiki. Make sure you do NOT add the TFT_eSPI library from the IDE library options at anytime but download the library from the WIKI! I was able the have no problems compiling the examples.