4K runs slow motion and only 1920 x 1080
From as requested by Christian Hewitt, and I hope I'm doing this correctly please be gentle if not.
I have just downloaded the version Kodi 19.1 (Linux Kernel 5.10.x)
Run the image to my MicroSD card and checked the config.txt file there was not mention of hdmi_enable_4kp60=1 I have added that in, and booted the Rapsberry Pi 4 B which is the 8GB RAM also a mention on the released version LibreELECT 9.2 I was able to use the iPhone Kodi Remote app. With this version I have not been able to connect with that so I am using a Wired USB Keyboard and Mouse.
On boot up it showed on the Bauhn 75" 4K panel that it was displaying at 1920 x 1080 and at 60 Hz no changes there like the previous run.
I must apologies for the screen shots, I thought I would be able to SSH to the Kodi and get the log files but that's not working either.