Hi @Ashwin
You can isolate projects using project roles, here is a complete guide: https://confluence.atlassian.com/jirakb/limit-restrict-user-s-project-access-280069544.html
Hope this helps
JIRA works by GRANTING access. You can't restrict access. By default, it grants access to the group used to logon (used to be JIRA-users but may be different on your version). This is probably where you're getting the access from.
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