Let’s force the 4 outputs with an EDID and do eyefinity to have an desktop extended over 4 screens.
Check that the outputs are correctly configured in the output tab (if you have done the initial setup on a single screen, the resolution of the outputs has been done at the ratio of an output and it is necessary to correctly configure each output.

!{VIMEO-LINK + port-1-mp4}!

Disable monitoring (or possibly NDI stream)

!{VIMEO-LINK + port-2-mp4}!

Display a test pattern on all outputs to check that everything is working correctly.

!{VIMEO-LINK + port-3-mp4}!

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