Thanks for the feedback! We are working on this.
Current Dark Mode support: https://docs.microsoft.com/en-us/officeupdates/release-notes-office-for-mac
An error occurred while saving the commentJohn Morris commented
I am also on the Insider fast build, and still my reading pane is white. A coworker at the same company on the same build and on the same license has the dark reading pane! This is madness! Why make it available to some and not others?