Hey,

I'm running a vanilla campaign and I only want to use spells from the Players Handbook.

My players are able to see and prepare a lot more spells than this :(

I've double-checked: the "homebrew" content is disabled

I removed all content sharing, except the PHB (which I purchased and am sharing with a master-level subscription)

Any help would be appreciated!

You can't.

If people have access to more spells, they can use them for their character and there's nothing you can do to stop them.

Aside from, y'know, the normal way a DM does : tell them not to, check, and warn/kick the people breaking the rules. This is why DMs have access to everyone's sheets.

Thanks for the (unfortunate) answer!