[SOLVED] Raspberry Pi 400 running latest SarPi has borders around display

I'm running the -current ARM installed via the fatdog SarPi installer on a Raspberry Pi 400 with dual monitors and have a small border around the displays. I compared with the original Rasbian that came with the 400 and both are set to the same resolution of 1920x1080. I have the border in init3 as well as xwindows. I've compared the /boot/config.txt between the two and don't see any differences.
Any suggestions where I can troubleshoot screen sizes.