Knowing that in the process of using Digital Signature, you have met a difficulty that the PDF Icon can't be removed. You can try the following to solve your difficulties.
Note: Once an electronic signature is created, it cannot be changed. If the electronic signature you received is not in the format you desire, you'll have to create a new one.
We believe you have already known how to add a digital signature, you can follow the previous process again. But, if you forget, you can check How to Add Digital Signature to a PDF. When you have completed the previous steps, come to the Customize Signature Appearance page, you can remove the PDF Icon by ticking Logo.
If you still have other questions, please contact us.