After taking a closer look, the default button isn't even control so "without control" must be referring to "without using a key". A bit confusing so the easiest fix would be to rename it.
"Flip through hotbars on mouse wheel without control"
->
"Use keybind to scroll through other hotbars"
The option true/false would need to be switched around though, so don't forget to change that.
True => Can only scroll to other hotbars if you're using that keybind
False => Can always scroll to other hotbars.