input – read-only fields in material design

I wonder how to apply style to fields in a form for users who have read-only access.

According to the MD guidelines, read-only fields must have a help text that indicates read-only. However, in the situation where the entire form is read only because the user can only see it, how should I customize it?

Should I use the field style disabled? Or should I eliminate the delineated edges? (I am using the type of material design fields described).

Thank you!