It’s browser height, so you can affect an element as it appears at 0% through to it disappearing at 100%. You can’t effect it prior or post it being visible
I obviously had it set at 110 before I limited the stack to 100. As soon as you stru to change it the limits will be applied.
It is possible to have percentages less than 0 and more than 100 but I removed this option as it will only work with certain other settings and I thought people would just complain