When you have the wing type as a tailless wing with 2 aileron, you set up the amount of elevator travel in the AFR(D/R) area of the model menu. You can touch the panel that allows you to select which channel you are setting. You'll find "elevator" in the list. Select it and then set your travel in the AFR(D/R) menu.

If the AFR won't give you enough elevator travel, you have to adjust the position of the pushrods on the servo arms and control horns to get the travel you wish. Then adjust "down" the amount of AFR on the aileron channel.

That's how elevons are set up.

Later edit: Poster "OAK" mentioned that the Elevator to Camber mix needed to be adjusted to 100% on the second screen. We did further checking and found that to be so only if your transmitter was not already set to 100%. Our transmitter defaulted to 100% when we set up the elevon mixing. We then used the AFR to adjust throws on our test model.