When you make a change to the view (view: Views give you different ways to look at the same information in a folder by putting it in different arrangements and formats. There are standard views for each folder. You can also create custom views.) in a mail folder, the change generally only applies to that particular folder. There's no way to make that change "globally" (for all the other mail folders at the same time). This applies to things like adding columns, using the three-line AutoPreview, grouping, and sorting.
The Reading, or "preview," Pane, turned on by default, also cannot be turned on or off globally. If you choose to turn it off and don't want to see it in any of your mail folders, you must turn it off for each folder.
Note Changes to the other two panes in the Outlook window, the Navigation Pane (Navigation Pane: The column on the left side of the Outlook window that includes panes such as Shortcuts or Mail and the shortcuts or folders within each pane. Click a folder to show the items in the folder.) and the To-Do Bar, work differently; change in one mail folder is reflected in all mail folders.
The Reading Pane, highlighted in red, allows you to preview your messages without having to open them.
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