Sergio

try setting grab interval to 100

is it dying just as fast at 100? try limiting prismatik to like 20 leds

my guess is your serial chokes, 300 leds is a lot for 115200 baudrate, look here https://www.partsnotincluded.com/calculating-adalight-framerate-limits/ ambibox might be juuust slow enough for it to work (but I don't...

is your power supply good enough?..

and if you limit prismatik to like 50 leds?

this is solvable manually, not in the most practical way, but if you want it now... on both displays I would - put 89 leds - click Andromeda - set...

full screen as in watching a video? (any video?) or when you put the whole app in fullscreen?