How to make Joplin app in my Android phone read-only?

I am using Joplin note taking app both in my Ubuntu 20.04 PC and Android phone running Android 10. I sync my notes from both devices into my Dropbox account such that the notes are same in both my PC and phone. I edit and add new notes from my PC only and use my phone to only read the notes. But sometimes by accident, I end up editing or outright deleting my notes from my phone. So how can I set my Joplin app in Android phone to read-only mode to prevent any accidental deletion or update?