To quickly unlock the screen and save time, simply double-tap the screen to wake it up, making unlocking effortless.
Double-tap to wake up the screen on OPPO A37 (A37fw) as follows:
Step 1:
Go to 'Settings' and select 'Gestures and motions'.

Select 'Gestures and motions'.
Step 2: Choose 'Gestures when screen is off'.

Select 'Gestures when screen is off'.
Step 3: Turn on 'Double-tap to wake up the screen'.

Enable 'Double-tap to wake up the screen'.
That's it! You've successfully activated the double-tap feature to wake up the screen on OPPO A37 (A37fw).