I can't seem to get Horizontal preview to 'stick'. I have this issue in multiple browsers on multiple computers.
Steps to reproduce:
- Settings > All > Mail > Mail View Options > Select 'Open Message in Horizontal preview'
- Select message in inbox and Horizontal preview will work as expected.
- Refresh browser and message will open in Vertical preview
- Click on message in inbox twice and Horizontal preview will work again
Desired outcome: Messages never open in Vertical preview when Horizontal preview is selected.