switching formations

[Corona]

This is the formation for my next match. Person plays 5-1(dmc)-2(mr/ml)-2 guess best to go through the middle and let my mc's go forward to take use of the space. let my mr ml normal to deal with his mr ml. His team much better then mine its a friendly match (14.3 vs 20.8). But that not really the question. what i mean is, is it bad to switch formation everytime becouse they not used to a formation?