How to disable KStars from starting up automatically?
KStars automatically starts up on system boot. To disable automatic startup, toggle it off from EkosLive Dashboard at http://stellarmate.local
Alternatively, you can also disable it from the terminal:
systemctl --user disable --now org.kde.kstars
KStars is required to run StellarMate App. Therefore, if StellarMate App is used, it will launch KStars regardless of startup settings since it is required for the App to operate.