Hello
For using elementor you in front page you will have to place this code below in the template/homepage.php file

<?php the_content();?>

You can do it by going to appearance >> theme editor >> template folder and you will find the homepage file in it
Paste this code before the get_footer(); function in the bottom
This will allow you to add elementor templates at the bottom of the page.
But you won’t be able to change our theme or edit it. You have to do it through the wordpress customizer with the given options.
Thank you