How can I tell if someone is connected to my device or mirroring?

[jah420]

How do I know , if someone is connected to my device or mirroring 

[MrGhoul]

Tap link,
How to tell if your device is being mirrored.
https://softhandtech.com/how-can-you-tell-if-your-phone-is-screen-mirrored/

Tap link,
Steps to take if you suspect your device is being mirrored by someone.
https://www.wikihow.com/Stop-Someone-from-Mirroring-Your-Phone