3.5 inch isn't showing octodash

[ghost]

What doesn't work?
I have reinstalled OctoDash several times already. When I install it and connect a screen via HDMI, I can see OctoDash. However, when I do the exact same thing with my 3.5-inch LCD screen from Waveshare (https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(B)), I only see the command prompt and not OctoDash

What did you already try?
I have reinstalled OctoPrint multiple times and added OctoDash. I've also tried it via HDMI, and it worked. However, I cannot use it in my project.

General Information:

• Hardware: Raspberry pi 4, 3.5inch RPi LCD (B) waveshare
• OS Info: Octopi (stable)