Cannot habilitate hard press or double tap on Samsung Galaxy 9

[Android Central Question]

Dear sir,
Cannot habilitate hard press or double tap on Samsung Galaxy 9. I've tried about all I can after extensive online searches.
Please note that the function does not work when the screen is off, but the home button and others are functional when the screen is on.
I'd appreciate your guidance.

 

[Gumby1978]

Settings, lock screen, always on display, display mode