Can't select DXN slot in layout
I have a set with 5 actual characters and 2 dxnothing slots (for corner layout). However, when setting up a window layout, it only lets me choose between 5 slots. If I look at an existing layout that already works, Region 6 is set to Slot 6, but there's no Slot 6 in the dropdown so I have no idea how it got there?