Hello!
Split the same video source iunto multiple screen it's not the best solution because each of these would use memory and CPU resources, so we strongly discourage this method (and no other LT user do this...).
The best solution is certainly to use HDMI splitters, using these simple an cheap hardware guarantee you an always perfect result without having to change any settings.
Just avoid very Basic and Supercheap product (like this
https://amzn.to/4csGXrl)
Personally i use this
https://amzn.to/45SlipZ and work perfectly after 1 years of live stage