This is still happening. I have uninstalled all Fenix liveries, deleted the folders in community, uninstalled both GSX and Fenix base entirely, reinstalled both. I have not selected seated passengers in any of the Fenix planes in the GSX Config screen, per D.Fidalgo above. I have installed/linked into FS2024, did my first flight there yesterday using GSX etc, and I have passengers walking onto the plane, down the cabin and sitting down!
There must be some sort of config file somewhere which is lurking even when GSX and FSX uninstalled, and it's not reflecting in the GSX config screen.
I'm sure it's a quick fix, if I only knew where to look.
Any advice really appreciated. As much as I enjoyed seeing the passengers sitting in the cabin, I don't want to allocate any of my limited PC resource to it on an ongoing basis.