How do you easily lock down a project to a small group of users

[Conor_McGuinness]

I want to restrict a Project and Board attached to that project to 6 jira users only. Is there an easy way to do it ? 

[Nic Brough -Adaptavist-]

For the board, look at the sharing options and make sure they are only granted to the project, or a group with those six users.

For the project, it's a bit more complex.  Look at the permission scheme for the project, and look at who can "browse project" - you need to make sure it is only your six users who can do this. 

If you have a good scheme, it will probably say "browse project: role (users)".  This is good because it means you can go to the "people" section in the project and remove any group or user you don't want to see this stuff (e.g. the "jira-software-users" group, which is the same as "anyone who can log in").  If it says something else, you're going to have to think a bit more about it.