I already tried doing it through Issues Security schemes and group permissions but I'm not getting a user to see only the issues of his project.
I found a thread of 2018 saying that is the expected behavior and that is not possible to restrict a user just to his project, but I really need to know if there is any news or fix for this issue or behavior.
If your setup is correct you can restrict users to see just the projects they need with a proper permission scheme, and restrict the issues they see within that project by using a security scheme.
Your permission scheme should be based on roles and you should worry about adding the people to the roles they are supposed to have (ideally by being part of a group instead of adding the users individually)
No worries, jira can be messy at first. Roles are shared across all projects, try to use generic names on them to reuse them better.
Ideally, you should have a single permission scheme that you would apply into any project you create, the more you reuse, the better
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