Requirements

[pacman43]

Samsung one ui should include -
 
RGB accents 
Double Tap wake/lock
Improved Always on display
Improved dark theme ( include pure black)

[Jeeban95]

Double tap to wake is available. For dark theme use high contrast themes present in settings that's a pure black one.I think u r indicating display correction? RGB correction opt is also available.

[pacman43]

Double tap on the homescreen doesn't work.

[Pras1]

how to set double tap to wake

[pacman43]

Double tap is only available in always on display