Add a folder as a favorite
- Open Email.
- If the folder you want is not displayed, tap the email account name to display its folders.
- Tap the star to the right of the folder name.
Favorites appear at the top of the accounts list.
To remove the folder from favorites: Repeat steps 1 and 2, and tap the star again.
Checked against the LuneOS code and installed apps. Nobody has tried these steps by hand yet, so tell us if something differs.