Outlook 2016 Toggle the Reading Pane using Keyboard Shortcut


New Member
Outlook version
Outlook 2016 64 bit
Email Account
Office 365 Exchange
When I select the "View" tab in Outlook 2016 and select the "Reading Pane" drop down the first letter of the "Right, Bottom & Off" options are all underlined. This seems to indicate that there is a keyboard shortcut to toggle the reading pane on & off.

However, I can't figure out how to make this work. Can anyone help me on this?

Thank you!