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How to turn off double tap to wake up the device on my Lumia 640 XL on Windows 10 Mobile?
Go under settings, then search for touch. You can go directly go under Settings > Extras.
Settings > Extras
Under there you will see the touch option:
Then under the option, you will see the option to turn off double tap to wake up.
Settings-> Extras-> Touch-> Wake up the phone when i double tap on the screen (On/Off)
Required, but never shown