In Community, when a new retailer(B2B users) logs in to the system, the user is able to see all visible brands that they have matching Verticals, Categories, Sub Categories, and Genders with when they signed up.
If they selected any Verticals, Categories, etc... that do not match any brands, then they will not see any once they initially log in and will need to search for them.
If you as a Brand decide to opt out of Community, you will not show up even if you match with a new user - they will not see your brand when they log in.
If you have any questions regarding this, please reach out to [email protected]