What happens: After setting the enable enchantment option to false, I am still able to see them in JEI and have books with the enchantments

Adding new enchantment (existing property will be preserved). [false/true]
B:"enable enchantment"=false

Desired solution:

• Configuration would have a list of each enchantment, as well as it's max enchantment level.

"enabled enchantments" {
    B:Corrosive=true
    B:Lifesteal=true
    B:Poisonous=true
}

# enchantment levels
#--------------------------------------------------------------------------------------------------------#
# Maximum levels of each enchantment

"enchantment levels" {
    # Min: 1
    # Corrosive Max 5
    I:Corrosive=5
    # Lifesteal Max 3
    I:Lifesteal=3
    # Poisonous Max 3
    I:Poisonous=3

• When a Enchantment is set to false, the Enchantment is:
  • Removed from any item in the game that bears the enchantment (book, sword, etc) (they still appear)
  • Removed from JEI (they still appear)
  • Removed from Anvil recipes (already does this)
  • Removed from being found in any loot tables (treasure chest, mob drops) (unconfirmed behaviour)
  • Removed from being found in a librarian to trade with (unconfirmed behaviour)

Version of Fish's Undead Rising used: Fish's Undead Rising-1.4.2
Minecraft version: 1.12.2

Yes, they won't be removed from existing enchanted book / equipment. It's too resource consuming to check all of the enchanted books and equipment one by one, and removing the enchantments' ID from registration isn't a recommended solution either.

The config is intended to only banning the enchantments from appearing afterwards but existing ones stay.