Bookcase looks very nice in our Master Bedroom.  The shelves are adjustable, except for the middle one, however we didn’t have to adjust them.  The only “assembly” needed was to put on the handle, the issue was that it was missing.   I talked to Customer Service and we resolved the issue without having to send back such a big heavy piece.  We were able to find a suitable handle and install it ourselves.  It did require we drill a new hole as the spacing wasn’t quite right for the new handle. The new handle did cover the original hole so all  was good.