...
How Jira admins can access the app settings page
As Jira administrator, go to Apps → Manage your apps → Epic Clone settings on left sidebar to access the configuration page for Epic Clone.
...
What Jira admins can configure on the app settings page
Access to Epic Clone can be restricted to either certain projects, or to certain user groups. As said above, by default nothing is selected and the app is available in all projects and for all user groups.
To restrict access to certain projects, select the projects in the respective field, click on add and save the configuration. The same procedure can be used for groups.
...
The save button only appears when you changed something in the configuration. Selected projects or groups can be removed by clicking on the trash icon next to them.
...
When the save button has been clicked, the following message appears that the new configuration is now saved.
...
How does it look like when access to Epic Clone is denied
Unfortunately, it isn’t possible to hide the Epic Clone issue action completely if the app is not available in a project or for the user accessing the issue.
However, the following message appear when Epic Clone is not available in a project but the issue action is opened by users.
...
If Epic Clone is restricted to certain user groups and an user not in those groups opens the clone dialog, the following message appears.
...