Algorithm uses 3 and 4 items (Reagents) for Tier 1. This will change in the future. For Tier 2, it uses an additional 5th item. Tier 3 probably is not achievable yet. We'll check it in the future.
Armor: helmets, armors, gloves and boots
Necklace: all necklaces
Weapon: all weapons and shields
Click to select enchantment type.
You can unselect/select reagents by clicking each of them. Since the number of reagents has been increased (there are billions of calculations), it is best to deselect all of them and select only the ones you are interested in. However, we're thinking about a solution in the future.