If you use Elementor PRO, everything is much simpler. This functionality was created only for people who use the free version of Elementor, because in PRO version functionality to create footer templates is already available by default. You can find out how to do this here.
Footer Type Templates is a sets of elements such as copyright, social links, subscribe forms etc. that together make up the different footer styles.
You can find them by going to your Template Library and selecting the Footer template type.
In Theme Options > Footer tab, you can choose standard foooter template.