Currently, all enchantments (except the ones that conflict with each other like mending and infinity, meaning you could put one but not the other) are able to be put on a single weapon/ armor piece.
Environment
Currently, all enchantments (except the ones that conflict with each other like mending and infinity, meaning you could put one but not the other) are able to be put on a single weapon/ armor piece.
OP that’s because you’re enchanting in creative mode.