Imported stl is grey not green

Hi all

this ls probably an obvious one, but In can’t find any solution in the search.
I just imported an stl from Blender, it’s marked printable, but instead of the usual green, it’s grey. It has a few non manifold edges calling for repair, but other stl had that issue too and were still green. The slice info also in limited to just 3 infos and not the color coded usual list.
What am I missing?
Thanks!