If you mean you want to remove a user's access to a single project, you need to remove whatever permission it is that is currently letting them in.
Read the permission scheme for the project and look at how it is granting access (browse project is the most important line). Then make sure the user no longer matches that rule.
Can you believe there's less than one month until Summit 2019? It's time to start planning your agendas, not to mention packing ... In the meantime, introduce yourselves on this thread so that you ...
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