After a little bit of a search DisplayLink was locked in "Security"/"General" of the preference.
Now unlocked, the screen are alive, but with a resolution which was current before 1995...
I noticed that MacOs consider both screen with Airplay like videoProjector yet, and show on Monitor as Monitor(1) and Monitor(2) but can't identify or change any resolution.
If anyone has an idea.. Otherwise I'm still looking for a solution.
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