A 'hidden' project will still be visible to people with admin permissions; regular users won't be able to search, view or modify any of the project's issues.

You can't edit project permissions or roles on the Free plan for Jira Software or Jira Work Management, and you can't configure issue-level security on any Free plan (including Jira Service Management). Find out more about how project permissions work in Free plans. To take advantage of Jira's powerful project permission management features, upgrade your plan.

  1. Create a new permission scheme, and leave all of the permissions empty:
    1. Select > Issues.
    2. Click Permission Schemes > Add Permission Scheme.
  2. Associate the new permission scheme with the project that you wish to hide (see the section Associating a Permission Scheme with a Project ):
    1. Choose Settings > Projects. Select the relevant project.
    2. Open the Project Summary administration page for that project. (See Configuring projects.)
    3. In the Permissions section, click the name of the current scheme.
    4. Click the Actions dropdown menu and choose Use a different scheme.
    5. On the 'Associate Permission Scheme to Project' page, which lists all available permission schemes, select the permission scheme you want to associate with the project.
    6. Click the Associate button to associate the project with the permission scheme.

As an admin, you will still be able to see hidden projects. People without admin permissions will not be able to see hidden projects.