This can definitely be done and here's what I would do:
For the project you want that user to see you'll assign the permission scheme that has Browse Project permissions for that group.
For the projects the user(s) should not have access to you'll want to assign the permission scheme that does not have the Browser Project permission for the group/user(s).
Hopefully that makes sense. Here are some resources to help you get started creating Permission schemes:
Hi Kelsey Schindler, Is it possible to do this without using permission schemes but only groups and roles? We have Jira in cloud. Our issue is similar to Brandens. We have a vendor team that should only access 1 project. But what we want to do is instead of changing the oothers permission we will restrict the permission to these three users. We have made a group for them, but need to know how they can have application access, to log in, but still only see 1 project. Hope you can help me too :)
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