What Is?:Character Movement Component ->Ledge Check Threshold

Hi! I’m exploring Character Moving Component. In Character Movement:Walking you can find parameters: Can Walk Off Ledges (works as expected) and Ledge Check Threshold. Actually I can’t achieve any changes using this last parameter and I’m curious what does it mean. The tooltip says:
“Used in determining if pawn is going off ledge. If the ledge is “shorter” than this value then the pawn will be able to walk off it” Ok - but how “shorter”? In what axis? Thanks for attention!