The sensors off feature is very useful if privacy is your main concern. When turned on your device cannot access any sensor on your phone this includes mic, cameras, proximity sensors etc. To turn it on open your Settings>Developer options>Quick settings developer tiles then toggle it on.
Go to settings> about phone> software information & press "built number" 7 times then enter the password you use to open your phone then exist to the main menu of your settings. Right at the bottom you'll see developer options.
