I understand better now. Thanks so much! I think I was confusing the distinction between "indented" and "change of margins".
If I'm understanding correctly, the displayed material might be considered as displayed due to a change of margins.
Even though the print margin may be an inch from the edge of the page, this paragraph could then either be blocked or perhaps indented. But if it's considered displayed, then I know to skip a line in the braille before the paragraph and after the paragraph.
And it doesn't matter I guess whether the print margin for a paragraph is an inch from the left side of the page or 2 inches, it's all just considered to be displayed in braille.
Perhaps it's not that important for the braille reader to know that print paragraphs may have changes of margins of different amounts. Or maybe there's really no good way to indicate that in the braille.