[RobinTW]

I have Kodi 18.7 installed on RPi OS / RPi 3B+.  When dim mode screensaver is activated, it shows a mix of dimmed Kodi and RPi OS screens.  How do I get rid of RPi OS screen in this case?

[Nachteule]

I have Kodi 18.7 installed on RPi OS / RPi 3B+.  When dim mode screensaver is activated, it shows a mix of dimmed Kodi and RPi OS screens.  How do I get rid of RPi OS screen in this case?

You have to switch to an unused VT

I use a script something like that:

#!/bin/sh
VT=<unusedVT>   # Number of an unused VT
chvt $VT
echo "clear screen and hide cursor on virtual console"
setterm --clear all --cursor off > /dev/tty$VT   # Clear screen and cursor invisible

[rascas]

There is no need to change VTs on the RPi 3 and below, OPs problem shouldn't happen but he has to provide a full debug log for more info. https://kodi.wiki/view/Log_file