“There is”:

Il y a

Negation (“there is not”):

Il n’y a pas

“There is not anymore“:

Il n’y a plus

“There is no bread anymore”:

Il n’y a plus de pain

You can replace “de pain” with the pronoun “en”:

Il n’y en a plus

Translation: “There is none anymore” or “There is no more.”

More = PluS (pronunce the S)
"Il y a pluS de monde or il y en a pluS (EN replaces Le monde (people))
No more = Plus (don’t pronunce the S) and it’s always negative : "Il N’y en a plus" (N shows the negative form)