As an android enthusiast, who also is into the 3D printing scene, my first thought was “what does this launcher have to do with OctoPi and OctoPrint?”.
The answer, nothing… obviously. Guess it’s just an SEO and a me problem 🤪
I think what’s happening is the app is using Android’s account manager to store credentials. These are part of the system and not removed when an app is uninstalled.
If this is what’s happening then you can go to “Passwords & accounts” in settings and find the account to remove. There really shouldn’t be any data left over and you shouldn’t need to clear app data and cache before uninstalling, the system takes good care of that when the app is uninstalled.
Since I’m into 3D printing, I know of this project: https://github.com/gaifeng8864/klipper-on-android
It allows an android device to run a printer that uses the klipper firmware.