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Hi,Make sure that you have done below steps before doing the above steps.From the object management settings for cases, go to Page Layouts and open your case page layout for edit.Ensure the Email quick action is in the case page layout.Without the Email quick action, you can’t send articles via email.Select Quick Actions in the left-hand menu.Drag Email to the Quick Actions in the Salesforce Classic Publisher line.Note:If you can’t see the Knowledge One sidebar, increase its width to 250 (height to 150) in the page layout. These are the minimum measurements for the Knowledge One sidebar to display properly.Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution. Best RegardsSandhya