I've attached images of how to setup Single Tap on the new OneUI. Hope this helps!
You must go to Settings > Accessiblity > Interaction and dexterity > toggle Assistant Menu ON > Toggle on SINGLE TAP TO SWIPE. (Shown in Pics 1 & 2)
You need to keep Assistant Menu active or it won't work. After going back to your Home Screen you'll notice the Assistant menu (shown in Pic 3 ) Tap and Hold and you'll see the X to hide it. Drag it there, then pull down your notification bar and slightly swipe the assistant notification to either side so that you can enter the settings (shown in Pic 4 ).
Lastly set the notification style to what is shown in Pic 5 .
I really hopes this clears it up for everyone
