functions.php

<?php

add_filter( 'swas_footnote_start_number', 'be_footnotes_start' );
/**
 * Footnotes Start
 * @since 1.0.0
 *
 * When viewing "All Pages" option, ensure start number is 1
 *
 * @param int $number
 * @return int
 */
function be_footnotes_start( $number ) {
	global $multipage;
	if( get_query_var('all-pages') && $multipage )
		$number = 1;
		
	return $number;
}