Please help me tell about what is "Screen views" and why it's double number? How to calculate it?

Please help me tell about what is "Screen views" and why it's double number? How to calculate it?

Screen views are used to track how long a user might be on a specific screen.
Google Analytics tracks screen transitions and attaches information about the current screen to events, enabling you to track metrics such as user engagement or user behavior per screen.
You can read more about it in the documentation HERE and create your own manual screen tags