Outlook—Removing the reading pane
By default, outlook provides you with a preview of your currently selected message in the reading pane. If you would like to disable the reading pane, you can do so by going to

View >> Current View >> Define Views
Select Messages and click Modify

Click Other Settings

Under Reading Pane, change the setting to OFF

Select OK, Then Select OK again, Then select APPLY VIEW
The reading pane should now be gone for all your views.
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