How to limit account access and user privileges to single companies

I’m new to invoice-ninja, self-hosting.
I have users set up.
I have companies set up.
But I can’t see how to limit users to the companies they should be able to see.

Am I just missing it or do I need to add this capability?


In v4 an added user can only see data in the one company they belong to.

Only the account owner can switch between all of the companies.