The description for... like ALL of the concentrated boss crystals... have so much information that the top and bottom of the information box gets cut off when I put my mouse over the item icon. Is there anyway to adjust this so that I can see the entire box?

You could try to reduce UI Scale in settings and see if you can live with other things becoming smaller to a hopefully acceptable level.

Had to do this for my Blackstar gear in 1080p from 100 down to 90.