Background map masks the 3D Model in some areas of the project

We have integrated the satellite photos (file 3SM) and made it as a backgound map into our 3D Open Road model.
In some areas of the 3D model, the background map masks the corridors and the 3D model of the project
(see attached screen capture).
Is there a way to have the project averlay the background map and make it always shown ?

Thanks.