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How do people indicate when the combination of multiple fields in a form is invalid, when it isn't clear which one specifically is invalid? I'm thinking about just marking every fields as an error with the red outline, or outlining the group of fields in red

(Context is a bit esoteric. I'm making an entry form for UTM coordinates. You basically specify one of a bunch of sections of the globe, and also where in that section. Different sections have different sizes. If you specify somewhere outside the section you either specified the wrong sub-position or the wrong section or both. Also users will generally be copying all the fields from somewhere else).

That's a general design question, and not Compose specific, right?

There should be enough resources like that on the web for submitting addresses, credit card information, or any other structured data that has non-trivial validity rules.

You can start at <https://www.smashingmagazine.com/2012/06/form-field-validation-errors-only-approach/> and follow the links to the other similar content they have in there