On an agreement, each required question now carries a red asterisk (*), and optional ones still say (optional). The line under the title says how many required questions are left and names the next one; select its name to go to it.
Send for signature is no longer greyed out. If you select it before every required question is answered, nothing is sent: each question still to answer shows Needed before sending, and the page moves to the first one.
Send to signers in E-Signatures works the same way. Selected too early, it shows beside each signer whether an email address or fields are missing, with Place fields where they are. The next step under the title also updates as soon as you add a signer's email address, without reloading the page.