My phone details:-
Windows 10 mobile build 10586.71
moreover, i can't access the the setting setting for the same in settings>extras>touch. There is no option there to switch on or off the double tap, which was there in windows 8.1.
Lumia 550 does not support tap to wake up but it supports only double tap to turn off the screen. By this when you double tap on navigation bar, your phone will be locked.
settings-personalization-lockscreen- go down
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