deleting old settings

Cannot find this in the manual.
I have lots of old (and strange) settings, such as paragraph, littering my dropdowns. How do I delete all the old, unused settings?

thanks!

Which drop-down menus specifically are you needing to clear? It will be different depending on the menu.

I believe it’s true of the Line Spacing dropdown control that there’s no way within Scrivener to edit or remove existing entries; the user can only add new ones. Perhaps there’s a good reason for this, i.e. that these settings are being used somewhere in the project. But they need mnemonics; they all look alike.