How to obtain TWO styles of footnotes?

First, the overall appearance of footnotes is controlled in 2 ways:

1. The document's footnotes options, and
2. The paragraph style used to format the footnotes.

To control the line, its length, indents, etc. is under Type / Document Footnote Options. You'll find more controls there to help you under both tabs, Numbering and Formatting, and Layout.

In your screen capture, you show a wide 1-column layout, and then a 2-column layout. You might want to handle the 2 appearances this way:

• Don't have any left indent set in the overall footnote options.
• Create two or more footnote paragraph styles to give the different indents and appearances.
• You can always manually apply one or the other paragraph styles to a footnote, if the default one doesn't fit your layout on a particular page.