how can I change the square frame around the icon into a pie?

Hello,

Sorry but not getting you what is the pie.
Do you refer to a circle?
If possible share a snapshot for reference.

Yes, change the square frame around the icon to a circle in the widget of the informations of contacte.
Thank you

Hello,

?Please try to add the below CSS code from the Appearance > Customize > Custom CSS, and check.

.contact-info-widget.default i {
    border-radius: 50px !important;
}

it work.
Thank you

You are welcome.