Filter Bar > Sort filter options

filterbar-sort-filter-options.php

<?php
function tec_custom_filter_values_order( $values, $field ) {
	// Bail if it's not the right field
	if ( $field !== '_ecp_custom_2' ) {
		return $values;
	}

	$order = ["New", "Beginner", "Experienced"];

	usort( $values, function( $a, $b ) use ( $order ) {
		return array_search( $a['name'], $order ) - array_search( $b['name'], $order );
	} );

	return $values;
}

add_filter( 'tribe_events_filters_additional_field_values', 'tec_custom_filter_values_order', 10, 2 );