The jetway is the standard (One that came with the scenery)
Meaning it works with CTRL+J ? In that case, it's entirely normal you won't see any menu about which jetway and which door to use: standard jetway system only supports one jetway per gate, and it will always dock on the main passenger exit.
That's the whole point of using SODE jetways, and that's the whole point of GSX allowing to replace standard jetways on scenery that didn't come with those but, as clearly explained on the manual, GSX doesn't automatically replace standard jetway at 3rd party airports, the only standard jetways replaced by GSX automatically, are the default model used on default airports.
This very section of the forum has two tutorials on how you replace jetways on a 3rd party airport.