How to rotate the screen to portrait mode on Raspberry Pi 5 (Bookworm)

[itocafe0527-cloud]

Hi everyone,

I recently set up Anthias on a new Raspberry Pi 5 and I'm having trouble with the screen orientation. Here are the details:

Environment:

Hardware: Raspberry Pi 5 Model B

OS: Raspberry Pi OS Lite (64-bit, Bookworm)

Installation: Used the auto-install script (completed without any errors)

The Issue: I want to use my display in portrait mode. Although the installation was successful and I can see assets (images) being displayed, the output remains in landscape mode. Even when I change the display settings to portrait within the Raspberry Pi OS itself, the Anthias-viewer seems to override it and forces the display back to landscape once it starts playing.

What I've tried: I attempted to modify the orientation values in the docker-compose.yml file, but I couldn't get it to work correctly.

Question: Could anyone guide me on the correct way to rotate the screen to portrait mode in this environment? Is there a specific configuration in docker-compose.yml or another settings file that I should be looking at for Raspberry Pi 5?

Thank you in advance for your help!