I keep adding the Favorites tool bar do DO but when re-opening it, it's gone. I've saved settings - no help. I did a Factory reset but it still vanishes. How can I keep it so it doesn't vanish every time I re-open DO?
Settings > Set Lister Defaults, and turn on Save the default toolbar set.
That's usually all you need to do. If it's still showing the wrong toolbars, make sure this is turned on:
Preferences / Layouts and Styles / Default Lister / Ignore toolbars of Default Lister
Also, if you're opening a layout, the similar flag for the layout should also be on. (Or the layout should be re-saved with the toolbar present, if you want the layout to use custom toolbars compared to other layouts and the default lister.)