Permissions
By default, all users have access to all work logs. However, you can restrict it as a Jira administrator. To change the permissions, go to Jira Settings → Apps → Worklogs → Time Tracking → Worklogs Permissions.
First, you can select users or groups who can access and use Worklogs. To do that, toggle the switch off and choose particular users or groups. Users that haven’t been selected will not see the link to the Worklogs page and they will not be able to enter it.
Similarly, you can also choose who can see other users' Worklogs. By default, all users can do that. If you switch the option off, only users and groups selected will be able to view other users’ logged time. Those that are not on the list will still have access to Worklogs, but they will only see their own time entries.