.stl file is not opening

I install the rhino 6 evaluation and try to open the .stl file it will say that file is read successfully but the model is not seen on window. please help me

If you do a Ctrl+A does it say if any mesh has been selected? If you run a ZoomSelected what happens?

It says that meshes are selected

That means it is in the model space somewhere, try:

Ctr+A
Zoom
Selected

OR
Ctr+A
Move
“0”
Zoom
Selected

I like the shorthands ZE (zoom to see everything in active view) and ZEA (same as before, in all views) so no selection is necessary.

However, sometimes, there is one element - like a point - which is way out in space away from the rest. If you do a ZE or ZEA, you will see nothing… When that happens, I select an object or type of object and do a Zoom Selected…