Shoestrap 3 - custom layouts

functions.php

<?php

function custom_layout() {
  
  /* set conditionals */
  if ( is_singular() ) {
    global $ss_layout;
    
    /* set layout */
    $ss_layout->set_layout( 2 );
    
    /* control main section classes */
    add_filter( 'shoestrap_section_class_main', function(){ echo 'col-md-4';} );
    
    /* control primary sidebar display and classes */
    add_filter( 'shoestrap_display_primary_sidebar', '__return_true', 999 );
    add_filter( 'shoestrap_section_class_primary', function(){ echo 'col-md-8';} );
    
    /* control secondary sidebar display and classes */
    add_filter( 'shoestrap_display_secondary_sidebar', '__return_false', 999 );
    // add_filter( 'shoestrap_section_class_secondary', function(){ echo 'col-md-4';} );
    
  }
}
add_action( 'wp', 'custom_layout' );