No he's talking about the flight modes I believe. The newer AS3X systems have variable flight modes, I know on the Apprentice, it has beginner, intermediate, and experienced settings. Each one allows the user a little more freedom of control. Like in the beginner mode, it won't let you bank excessively or some other maneuver that could easily get out of control.

On the RTF versions it's controlled by a 3 way switch on the tx. You can also adapt the AS3X system so you can use one of the Spektrum tx's, like the 6i, 7, 9, and so on.

The problem with the 6i is that it has no 3 way switch on channel 5. So when you program the system, you can only opt to use 2 of the three modes.

So in the OP's situation, I looks like he will have to choose between 3D mode and one other, when he sets it up, then it's just a matter of flipping the switch to the other mode he chooses, and that in turn shuts off the 3D mode.