How to set up flight mode using Turnigy 9x radio

Hello everyone,

I am using an APM 2.6 board on a Traxxas Slash. While doing the configuration, I am able to set the range on the sticks of the radio, but as I move on to set up the different flight mode, there is no change in the flight modes as I toggles the switch. I have researched about this issue but have not found any solution so far.

I appreciate any help provided on this issue.