The Blueprint Manager is an inventory-only item which cannot be dropped, and you do not lose it when you die, unlike axes. Previously, it was impossible to organize blueprints bought in a specific order. However, on September 26, Defaultio released a "Builder's Update". They will be in the order in which you bought them, as well as categorized by their classification on the tabs to the left of the screen. When holding the blueprint in your hand you will not move until you come out of it or choose a blueprint!