I find that I visualize things vaguely/abstractly by default but I can put a bit of effort in thinking about the detail of the object I'm trying to imagine and then I can see that detail.

So I might imagine an Apple as a circle but if I need it in more detail, I put more effort into it, recalling the detail and able to see the red, the stem, peel it with a small knife, add a chunk taken out because it was bitten, etc.