Hi Jean! Unfortunately, you cannot. You could make them an Optional field, but then it will still say Optional when you mouse over; not really a good workaround. While I can see how it would impact the signing ceremony and the text of your agreement, it’s important signers understand clearly where they must complete an action to be able to Finish the signing ceremony.
Might be worth an enhancement request through your account team though!
I hope that helps, even if it wasn’t the answer you were looking for.
Have an excellent day!