Can the hand-held be used on is own with the rainfall turned off? and vice versa? I dont want them to both be on at the same time

The hand shower and rain shower head can be used separately. For this shower valve, the large handle is the main control handle, it controls water temperature by turning left/right and water volume by turning up/down. The small knob is diverter, which controls water running out from the rain head or hand held shower.