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Groups have specific Configuration options that are good to be aware of. Groups are very important for Form design as they allow for several pieces of additional functionality: for example, they (1) allow for a dynamic table of contents that allows you to include within the TOC the Groups most relevant to the record in question and (2) allow for dynamic If/Then Logic (also known as Hide/Display Logic in this guide), e.g. if I select "Yes" for Field X, then display Fields W, Y, and Z (but don't display W, Y, and Z if I select "No" in Field X).
See the screenshot and descriptions of the highlighted items in the screenshot below for information on what configuration options are available.
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