Hi @Tawni Servi , welcome to the Atlassian Community!
Whether a customer sees a certain service project in the Help Center depends on whether they are added as a customer in that specific project.
Please read through the following documentation: Add and remove customers
They were added to a project, but then have access to all other projects on their main help center page without being a "customer" of those projects. How can I restrict them to only their project?
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Can you check the Browse Project permission in the permission scheme associated with the projects they shouln't have access to? To which users/groups has this permission been granted?
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