Gboard for Android recently introduced a setting called “Flick input sensitivity” for Japanese users, and not swipe/glide typing.
In Gboard settings, going to “Preferences” reveals the new “Flick input sensitivity” option at the very bottom.
Rather, it’s for those with a Japanese keyboard set and use “Flick input.” Gboard would be wise to just show that preference toggle if a supported language has been added.
The wide appearance might just be during the beta and change ahead of a stable launch.
We spotted this Flick input sensitivity setting rolled out with version 12.0.07.457705062, which is the current beta, of Gboard.