Post settings doesn't work in Modern theme

Well, yes, single-post.php in modern theme does not respond to the post settings. Because most of the settings do not apply in the Modern theme's design. In case there is something particular where we can help you, do let me know.

Please mention which settings you want to be already set .

Add he given code in your wplms-customizer.php file in wplms customizer plugin  : add_filter('wplms_post_metabox','custom_wplms_post_metabox'); function custom_wplms_post_metabox($post_settings){ $post_settings['vibe_breadcrumbs'] = array( // Single checkbox 'label' => __('Show Breadcrumbs','vibe-customtypes'), // <label> 'desc'  => __('Show breadcrumbs.','vibe-customtypes'), // description 'id'  => $prefix.'breadcrumbs', // field id and name 'options' => array( array('value' => 'H', 'label' =>'Hide'), array('value' => 'S', 'label' =>'Show'), ), 'std'   => 'H' );   $post_settings['vibe_prev_next'] = array( // Single checkbox 'label' => __('Show Prev/Next Arrows','vibe-customtypes'), // <label> 'desc'  => __('Show previous/next links on top below the Subheader.','vibe-customtypes'), // description 'id'  => $prefix.'prev_next', // field id and name 'type'  => 'showhide', // type of field 'options' => array( array('value' => 'H', 'label' =>'Hide'), array('value' => 'S', 'label' =>'Show'), ), 'std'   => 'S' ); return $post_settings; }