Spelling Tool Doesn't Work in Scrivenings Mode?

After I almost released a book with the word “painkillerss” in it, I resolved the go through every word that Scrivener thought was an error, and either correct it or add it to the dictionary.

I figured I could use Scrivenings mode to open the entire manuscript, and take care of this.

But apparently, that can only be done for one document at a time. Maybe I’m missing something.

If there isn’t a way to do this for the entire document, consider adding that ability.