I had purchased PMDG's 737NGX. They have a new version which I downloaded, which is compatible with the Steam version of FSX.

4/7/2017.

I know that I used to be able to view the FMS straight on. I can get to it by clicking the center of the FMS view in the Virtual Cockpit view, but I think there is a keyboard shortcut to get there.

After capturing ILS with APPRoach mode, you get the Single Channel mode if one of the two autopilots is not on CMD, or if one of the two autopilots is not tuned to the right ILS channel.