Hi Ada
Thanks for reaching out.
the only thing we can do using CSS is to make the left padding of the third column to 0. The width cannot be set as this will break the responsiveness.
.footer-widgets-wrapper .widget-column.align-right {
padding-left: 0;
}
Copy the above CSS & Paste it in Appearance -> Customize -> Additional CSS
You’ll need to upgrade if you want more footer options.
Best Regards