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Sitecore's getPageEditorNotifications pipeline is responsible to show the alert in Experience Editor. I will not recommend hiding the notification in Experience Editor but if it is your requirement then you need to add your condition by creating a processor class which will inherit the GetPageEditorNotificationsProcessor or as per your requirement you can ...
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Deny access right always has the highest priority. You cannot revoke it with Allow access right later.
Set Allow access right for Item Read and Descendants Read for your role:
And for extranet\everyone break the inheritance on the item:
With that set, extranet\everyone will not have Read access, cause there won't be any rule which allows it. You can use ...
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