It will not be a mechanical switch - but a button on the camera - like a key symbol.
You have probably inadvertently pressed it at some time.
Check your manual re this device and how to 'Unlock'
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
Apple predictions 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.