content sharing question

I'm the creator/DM of a campaign and one of the players is the master subber with all the content. Is there any way for me curate which content is available to the players? Eg. If I'm running an eberron campaign and want to turn off SCAG, or if I just want to turn off Tasha's and go core book only, is that something that can be done by me or the master subber?

I've google searched for the topic but the threads I see discussing it as a 'future feature' are years old, so I have no idea what the current state is, or if it's possible.

You can toggle content from specific sourcebooks but that only stops the players from reading the books, not using the content on their character sheets. Some of the world settings have toggles on the Homepage of the character sheet, but it's not as specific as you are asking. 

Unfortunately, the best thing to do would be to tell the players not to use content from specific books and trust them not to use that content.