WebEdit.UsePopupContentEditor - Setting of the Day

In the /App_Config/Includes/Sitecore.ExperienceEditor.config file, you will see following setting

<!--  WEB EDIT USE POPUP EDITOR
            Indicates whether WebEdit uses the popup content editor.
            Default value: false
-->
<setting name="WebEdit.UsePopupContentEditor" value="false" />


In the Experience Editor (Page Editor) mode, when you click "Edit related item" option for any component

when "WebEdit.UsePopupContentEditor" setting set to "false" (i.e. Default value), Content Editor will open at the top of the same page (see the image below)

When "WebEdit.UsePopupContentEditor" setting set to "true", Content Editor will open as a popup window (see the image below)