Back  buttons

Back buttons for when the setting app is in narrow mode  ie phone

add a back button to take the user back to the start page so a user can get back to the start page with out exiting the app and reload on the  phone or narrow mode

button only show when app is in narrow mode and are in the lower tool bar on right

John 
the cobble monster

Signed-off-by: john mcconnell  johnmcconnell@yahoo.com