If you add a "Info Text" field type in the "Content type manager" the "Field Caption" doesn't become visible when you add a new Article in the F2C Article manager. This happens in Frontend and Backend.
The info field doesn't have a caption since there is no value/data being added. This has actually been removed a couple of years ago by popular demand because most found the caption for info text in the form illogical.
Of course you can always use submission form override to add it (or anything else) if you use F2C Pro.
Please read the F2C documentation before asking questions! Thank you if you've done so