Disabling prefilled fields according to number of signers

Hi Guys!

I did a search of the forum but couldn't find an answer to my question. So here goes.

I have a template with Pre-fill, Participant 1, Participant 2, Participant 3.

In the occasion that the document only needs 2 participants, some of my users are pre-filling fields that are meant only for Participant 3.

The field is not meant for Participant 3 to fill out. It is meant for the Pre-fill stage.

How do i disable a pre-filled field according to the number of participants?

Is it even possible?

Thanks!