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On the top Jira menu bar, click on Settings and navigate to Apps.
Once you are on the Apps page, click on configurations under Capacity Tracker.
Here, under the Admin settings you will find Jira Permissions control.
By default, permissions are disabled, meaning all the users who have access to your Jira instance will be able to access the Capacity Tracker and there are no restrictions.
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Once permissions are enabled your Jira administrator will have to go through the global permissions, project permissions and associated software scheme/role within Jira to configure the Capacity Tracker specific permissions. Please continue reading following guides for more details: