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.
Registry Hive | HKEY_CURRENT_USER |
Registry Path | software\policies\microsoft\office\16.0\outlook\options |
Value Name | disablereadingpane |
Value Type | REG_DWORD |
Enabled Value | 1 |
Disabled Value | 0 |