1. How to enable developer options?
Settings > About phone/device > Version > Click "Build Number/Version number" 7 times. If there is a lock screen password, you need to enter the lock screen password. After success, you will be prompted to be in Developer mode.
2. How to enter or turn off the Developer mode?
realme UI 7.0 & 6.0: Settings > System & updates > Developer options, turn off the developer options switch. (Developer options need to be turned on to find this option in system & updates)
realme UI 1.0 & 2.0 & 4.0 & 5.0: Settings > Additional settings > Developer options, turn off the developer options switch. (Developer options need to be turned on to find this option in Additional settings)
realme UI 3.0: Settings > System settings > Developer options, turn off the developer options switch. (Developer options need to be turned on to find this option in System settings)
realme UI R & T & S & Go edition: Settings > System > Developer options, turn off the developer options switch.