What to do if the A320 doesn't show in the sim?
Firstly, ensure Fenix is installed into the default location of C:\Program Files\FenixSim A320
You do not need to install it into your community folder.
Then, open up the UserCfg.opt
This can be found at:
MS Store Users: AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache
Steam Users: AppData\Roaming\Microsoft Flight Simulator
Scroll down to the bottom of this file to an entry called "InstalledPackagesPath"
This path tells MSFS the location of your Community and Official folder.
Ensure the file path after "InstalledPackagesPath" is the correct location of your community and official folders.