Ah, that would explain why we’re talking at cross-purposes. The paragraphs within a document are set as elements, not the documents themselves. This is so that you can lay out the script easily – for example, indicating who is going to do something is one element (character), and indicating what they are going to do is another (action). You wouldn’t split these two bits of information across separate documents because they don’t make sense on their own, but you do want to format them differently within a document. Scriptwriting elements are not designed to handle the format of entire documents.
If you are not actually writing a script, and if you are just trying to set up different documents (in your binder) to appear differently on screen, I think that you would find it much easier to achieve what you want in the normal mode rather than script mode. Script mode is designed to help with very specific formatting requirements which change (and need standardisation) within the body of each single document. The regular mode is more appropriate for documents where formats, ruler settings etc are maintained throughout the document, although different documents can obviously be set up differently.
To my mind, the easiest way to change the formatting of entire groups of documents (so that they all end up the same) is simply to make sure they are not in script mode, then open them in a Scrivenings view, use Cmd-A to select all the contents, then set up the font, ruler etc. If different documents need different settings, repeat the process with the next group of documents. (If you use meta-data to indicate which group a document belongs to, you will be able to use Collections with a meta-data search to separate out those documents whenever you need them.) This will get your existing documents into the format you want.
If you want new documents to have a single specific format you can change the default for your project via Scrivener > Preferences > Formatting.
If you want new documents to have one of several different formats, I would recommend that you set up document templates within your project. Section 8.4 (“Document Templates”) in the manual gives full details. Basically, in each document template, you set up the text format, ruler, meta-data, text etc that you want (if you are using Collections with a meta-data search to identify documents in a particular format, it would be a good idea to set that meta-data in the template document, so that the new document has the meta-data pre-populated and you don’t need to remember to do it manually). When you create a new document, use Project > New From Template to select the base template to be applied.
If you intend using this same setup for future Scrivener projects, it might be worth thinking about saving the whole set-up as a project template.