Its not really clear it just says position 3 (stored in the motor assigned to position 3 , i think)

The Paper manual actually mentions a step 1,2,3,4 function in Positioner settings.

from the manual

using Diseq1.2
move: to move the dish use left right button
fine move: to move the dish in smaller steps press the left right arrow button
step : Set to positioner moving steps 1,2,3,4

anyway this is moving offtopic