After an update to the XFCE 4.16 desktop in EOS, I experienced problems with my NVidia drivers and was only able to load the OS in 1024x768 mode. No further resolutions were offered in Display settings, and Xrandr only showed one resolution available.
Following investigation I discovered that the issue lies in the DKMS installer and the LTS-Headers.
I had to reinstall both the headers and dkms and after a reboot was brought back to my original resolution of 1920x1080.
I have produced a small video to show the issue and how to resolve this should anyone else be experiencing the same within the September 2020 ISO.
I hope you find this useful, until an updated ISO becomes available.