All enchants work while holding down right click with shield
You can find this enchants from the enchantment table with the book
Enchants:
Decoy: Common, shield create decoy for protect arrow and fireball
Arrow Reverser: Common, all arrow your front changes direction and sometimes hit back enemies
Shield Force: Uncommon, push all mobs away
Shield Thorn: Uncommon, give damage attacked mob to you. Damage amount = Enchant level