Format all documents in binder

I understand that the formatting will be consistent throughout a document when I compile and print a manuscript, but how can I make the screen fonts the same on all of the documents in a binder? I’ve copied and pasted into the binder from other sources and have several different fonts now. Is there a way to change fonts for the entire document, or do I have to do it folder by folder?

Select all the documents you want to format in the binder and then use Documents > Convert > Formatting to Default Text Style.