This is a live form, not a screenshot — fill it in and submit it. The code tab is the exact file that is running, read from disk at build time, so the two cannot drift.
maxPrefix={16} is the whole point of this one: it is what stops an admin allow-listing 0.0.0.0/0 at two in the morning. The expiry field exists because permanent rules are how allowlists rot, and the colour tag warns on poor contrast rather than blocking it.