3D rotation knob zero position?

hello libertys!

so ive got a question. on the APC 40mk2 (that i just bought recently for liberation, so im not experienced with it) theres the knobs on the right side, some of them controll the 3D rotation, thats quite nice, but i can nottt get the rotation to stop using the knob, i cant put it on 0 agian, only +0.2 and -0.2 and to set it on zero i have to interact with the mouse agian to put it to zero, i hope you can understand my question, how can i use that rotation feature and be able to turn it off agian with the apc40?