In the original firmware from POCO, this setting will unlock the screen and lock the screen. This is written in the title "or turn off screend"
"Double tap lock from home screen is set in Settings/home screen/double tap to lock screen" there are no such settings.
XAGA_V14.0.2.0.TLOCNXM_v14-13 stable
model POCO X4GT
[Settings\lock screen\Duble tap to wake or turn off screen when device is locked] True. Screen off doesn't work.
[Settings\Sound & touch\] section "VIBRATE". Missing setting [Vibrate on touch] setting (Off, Light, Medium, strong).