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This feature allows limiting edit/view 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. A Now, you can control edit permissions according to the following logic:
if "Page Editors" field is empty → the connected page is editable editable according to the page restrictions.
if "Page Editors" field is not empty and contains a current user → the 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
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If no fields were added to a Jira screen Page Restrictions dialogue remains active and without changes:
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If the user has edit issue permission, then he can define page restrictions only from within Jira.
If the user does not have edit issue permission, then he can not edit page restrictions in Confluence.