Help Master Level S6 Ep3

Dear Friends, Community, MuOnline gurus!
Hope you are all well.

Is there a way to take Master EXP and Leveling Master when player is 400 level?
Atm when player is 3rd class pick exp everywhere.

What need to change to fix that?

I want from lvl 1 to 400 to pick only player(lvling) exp and on 400 to pick only Master exp.

Thanks in advance!