In Walk Navigation mode with gravity enabled, the jump height is
often inappropriate for the scene that you are viewing. This is a small
feature that lets you change the jump height in modal walk navigation
as you go, i.e. if there are varying elevation changes across the scene.
Pressing '.' increases and ',' decreases the jump height (because these keys
are the same for most layouts).
Pull Request: https://projects.blender.org/blender/blender/pulls/109827
f418e4f648