filter.php

<?php
// id: team_filter, key: category
add_filter('alm_filters_team_filter_category', function(){ 
   
   // Define empty array
   $values = []; 
   
   // Get all categories
   $args = array(
	   'order'   => 'ASC',
	   'orderby' => 'name',
		'exclude' => '1'
   );  
   $terms = get_categories($args);	
   
	// Loop terms
   if($terms){   	
      // Add All Item
      $values[] = array( 
         'label' => 'View All',
         'value' => ''
      );   	  
      foreach( $terms as $term ) { 
         $values[] = array(
            'label' => $term->name,
            'value' => $term->slug
         );
      }			
   }		
   return $values; // Return values	
});