www.horizonhobby.com/pdf/HBZ5400-Manual-EN.pdf
Page 5:
SAFE
- 2-way: Beginner/Experiences or
- 3-way Beginner/Intermediate/Experienced
You would have to try if either -100 is Beginner or +100.
Sorry Raimund, I do not remember DX8G1 default switch positions order anymore. You may ask the Spektrum pilots on RCL/RCN what the defaults are for direct switch assignments (no mixer).
Thomas