I bought mine online. Its a G-935FD. How can I make its calendar app to a regular one? I want Sundays to be shown in red instead of Saturdays. And there's that Hijiri date adjustment that I don't need.
Restart your phone. If it doesn't work, go to your phone's Settings > Device Maintenance > Battery. You should be able to see how the apps consume power. Identify those apps and uninstall them. Lastly, if problems still persist, bring your phone to a...