Poser - OFFICIAL F.A.Q (Last Updated: 2022 Jan 19 11:24 am)
You can choose your startup scene.
An all-surrounding environment like the 'construct' gives better results for PBR Superfly uses.
So: if you only use Firefly load/build your favourite start scene and set that scene as startup scene.
If you want to use Superfly without a background you can disable 'visible in camera' for the construct. It then has its effect in lighting but it is not shown in the camera.