This feature allows limiting edit permissions of a Confluence page. You can implement it via a multi-user picker field in a synced Jira issue. E.g. a multi-user picker field is created named Page Editors. Add this field to a Confluence page following these steps. Now you can control edit permissions according to the following logic:
if "Page Editors" field is empty → connected page is editable
if "Page Editors" field is not empty and contains a current user → connected page is editable by the mentioned user
if "Page Editors" field is not empty and does not contain a current user → connected page is not editable
To select a custom field for restriction, please make sure that multi-user picker field exists and is placed on the correct screens. Then select the field in the Configuration section of the app: