The Extension Point for messages is either Read or Compose. When the Reading Pane is off, you are doing neither so the add-in can't be available either.
It's documented on Outlook's Overview page for Office Add-ins Documentation.
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Is there any option/setting so I can see & use the outlook add-in when the reading pane is off ?
If not, is there any official Microsoft official document where it is written that Outlook add-in cannot be used when reading pane is off.
Thanks,
Srishti
The Extension Point for messages is either Read or Compose. When the Reading Pane is off, you are doing neither so the add-in can't be available either.
It's documented on Outlook's Overview page for Office Add-ins Documentation.