ok let me try again...
put everything in show and let say you know the geometry is around the origin of the file.
Do a Fit All In
Origin goes on one side of the screen
Make a trap and select the area around the geometry near the origin.
Change selection to no show
do a Fit All In
case 1: the zoom does not change and you don't see much on your screen.
you still have some element in show away from each other, use Search (on visible element) to find them or look at your tree.
case 2: the zoom does change and now you focus on some tiny elements
well in this case you're looking at what you search.
Please help us understand. Make sure all element are pickable.
Also check Tools/Option/General/Display // Performance : level of detail = 0, Pixel Culling = 0
Eric N.
indocti discant et ament meminisse periti