Declare signature field as mandatory field

Hello everyone,

I have a form which has different signature fields. One of the fields is the signature of the CEO. But the signature of the CEO is not always necessary. It depends on a field in the form. If this field is checked, the CEO has to sign. If the field is not checked, the CEO does not have to sign. I have solved this hiding and showing of the signature field with JavaScript.

But I can only lock the document if all signature fields in the form are filled in.

Here my hiding with JavaScript is ignored.

Although the field has been hidden by JavaScript and all visible signature fields are signed, I cannot lock it. Only if I show the signature field of the CEO and insert a signature here, I can block it.

Can someone explain a solution to me here? Is it possible to declare a signature field somewhere as an option and not as a mandatory field?

Thanks a lot already
Bastian