Hello,
 
Thanks for contacting us.
 
Please note that you can have the buttons from the form rounded from the Create section of the form ⇾ Design ⇾ Buttons ⇾ Border radius: 

You can adjust the pixels size to the desired one and make other design customization as well.
 
Feel free to ask if you have any questions.

You’re most welcome, anytime.
 
We’ll be here if you need anything else.
 
All the best,