My Library shows all the items in all the collections and shows consequently a disorganised mess. I want readers to go straight to a collection without seeing the mess
You're talking about a public library online that you're linking to from somewhere? (I assume this is related to your previous request.) You can't change the Zotero collections mode, so the library root will always show all items, but you can always link to a given collection instead.
Beyond that, you'd have to say more about what you're trying to do.
Upgrade Storage
You're talking about a public library online that you're linking to from somewhere? (I assume this is related to your previous request.) You can't change the Zotero collections mode, so the library root will always show all items, but you can always link to a given collection instead.
Beyond that, you'd have to say more about what you're trying to do.