I no longer see/have available all of the writing modes of this application. The only mode presently available is Text–>Scripwriting–>Script Mode-Screenplay (Command 3). How can I restore the others?
It sounds like you need to run the extras installer. These used to be built-in, but since the system went fully customisable, that changed and now they are extras. On the DMG you downloaded, there should be an installer that will set you up with some default templates and script formats. You can redownload the DMG from the Scrivener homepage if you need to.
You need to install the Extras on the Scrivener.dmg.
Ah, that worked. Thanks so much.