Do not display the reading pane
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\options Value name: disablereadingpane
Enabled: disablereadingpane = 1
Disabled: disablereadingpane = 0
Description
By default, the Reading Pane is enabled only in the mail module and located on the right hand side of the window. This setting allows you to disable the reading pane.