There is a mountain next to the battery mark on the top of Android with a sun-like mark on it. What is this? How to remove it?

This is the outdoor mode in the situational mode. You can modify it directly in the settings. (pictured)

Summary: Generally speaking, it mainly refers to the ringing of incoming calls and short messages.

Standard mode, usually ringing; The conference mode is generally vibration; The outdoor mode is generally ringing vibration. Of course, it can also be adjusted according to personal hobbies.

Suitable for meetings, outdoor and other occasions.