New to Version 8, wanting to get off on a good footing

Yes, GreyM1P is right, of course: you can use vault-selection to easily see the items you want to see. Or not. But if there were several vaults involved, then you'd want Collections!

In my case, I've four vaults for Annoying Entity's items, because those items might be shared with three different groups. Plus, I've a few vaults for my personal stuff, including "shared with spouse", "shared with family", and "nobody cares but me".

In order to quickly see all the Annoying stuff, or filter it all out, I've got Annoying Entity's vaults in one collection, and my own stuff in another.

So with two clicks I can see only the one Collection, or the other one, or all of it (by selecting your account in the app).

PS to @DerringDo:
That "Collections" feature is one of the few reasons I haven't reverted to 1Password 7, which is otherwise superior to the rewrite, because it has several important features that were unaccountably removed from the prematurely-released 1P 8, such as multiple-item tagging and reordering the fields within items.

Also, 1P 7 is innocent of certain ill-conceived & under-tested UI "innovations", such as the non-intuitive & non-standard behavior of Search. (Workaround: press Ctrl+Enter to see the correct & expected search results.)