Hi,
here is my setup.
an electric projector screen with a diagonal of 199 cm.
396 WS2812b LEDs are installed, 96 LEDs each on the left and right on one meter, 103 LEDs on the top and bottom on two meters.
The software runs on a Raspberry 3B+ with an Arduino Nano.
The screen can be moved in and out.
There are several clips on Youtube on my channel
greetings
Change the the "Settings Level" (via the wrench) minimum to "Advanced". Then you can set the baud rate.
After reading about the expert mode, I also found it and with it the settings for the baud rate. voila! Hardly you do it right, it works perfectly. 
Thank you!
The baud rate of 5000000 can be set in the Adalight Sketch, but apparently cannot be adjusted via WebUI. It was still possible via HyperConfig for the Hyperion Classic. 11520 is just too slow if you want to control 392 LEDs.
Es gibt ein fertiges Image für den Raspi, vielleicht hilft das ja weiter.
