Hey, I'm using X-Plane 10.45 from Steam, and I have the same problem. The manual says that you are supposed to be able to use the period and comma keys on the keyboard to move forwards and backwards, but this has not worked for me.
Nor has switching to 3D view, since apparently, if you don't have a custom cockpit for that plane installed, it just puts you to a 3D view OUTSIDE the plane. Could this be a bug?
Lastly, I tried looking for a field of view, but there was nothing like this under the settings and the Rendering Options. I'm wondering if the Steam version is different somehow??
This really sucks! I apologize in advance if I'm making a mistake, here, but I want to fly missions, and I really CAN'T DO THAT if I can't get access to the particulars lower on the panel...