Encryption of One Form

I have many different forms in my JotForm account. Is it possible to encrypt just one of them, leaving the others normal?

Yes, it is possible to encrypt just one form.

On your Form Builder, go to SETTINGS > FORM SETTINGS > SHOW MORE OPTIONS> then toggle the ENCRYPT FORM DATA option to YES.

For more information on Encrypted forms, please read the following help article:

Encrypted Forms and How to Use Them