I have casually found this feature without having enabled anything in
chrome://flags.
Suddenly the option has disappeared.
Why this behaviour? I don't understand why the feature was enabled, and I can't see why it suddenly has disabled (I've found Default mode checked in flags section).
EDIT Chrome version 81.0.4044.96
Chrome://flags. If they want to make it a permanent feature or not is upto then. User has no choice// Coming to the flag you are concerned about, in all the options except disabled, overscroll is there. Related question – beeshyams Dec 03 '20 at 07:07