slot initialization of halon sonic

(I am not a english-native speaker)At the first in my life ,I bought a daw some weeks ago.
I am a novice about music production.
Simply speaking, using halion sonic se3 3.4 (latest version)of cubase elements 10.5
slot1 of halion sonics se turns back always.
I changed instruments from gm01 accoustic to gm02 bright acoustic.
But after playling midi scores by automatic ,slot1 turns back to gm1 from gm2.
Please tell me how can I have instruments never change.