Remove beaver builder's 'go to top' markup and modify it with my own.

remove-replace-go-to-top.php

<?php
/**
 * Removes markup for built-in scroll to top link
 * 
 * Renders scroll to top button for wp_footer.
 *
 */
add_action( 'wp_head', 'dgs_remove_go_to_top' );
add_action( 'wp_footer', 'dgs_remove_go_to_top' );
function dgs_remove_go_to_top(){
	remove_action( 'wp_footer', 'FLTheme::go_to_top' );

	echo '<a href="#" id="fl-to-top" style="text-indent:-9999px;"><i class="fa fa-chevron-up" style="text-indent:0;"></i>Scroll Back to the Top of This Page</a>';
}