How to change mobility setting for new static mesh components?

[KVogler]

but why set them to movable if you don’t want them to move?

I dont. The engine does. When I add a static mesh component via blueprint graphs, the static mesh is movable by default.

just click stationary in your first screenshot

The mesh does not have a details panel, because it is created as part of the construction script.

they won’t move after you move them unless you have physics or something cut on,

I know, they will only move if I want them to, which I am not. They will never move.
The reason to set them to static is that they can benefit from static lighting.