Remove featured image

Hi,

I’ve checked the new featured for remove the featured image on single post. But this only works on posts. If I want to remove this featured image on CPT I checked that the code is on functions-enfold.php

So I copy my code and change the name of the functions to avoid problems with the original functions. So this is the code that I have in my functions child-theme file:

/* 
Add a checkbox to the featured image metabox 
*/
if(!function_exists('theme_featured_image_meta'))
{
	add_filter( 'admin_post_thumbnail_html', 'theme_featured_image_meta');
	
	function theme_featured_image_meta( $content ) 
	{
		global $post_type;
	
		if($post_type == "meeting")
		{
		    $text = __( "Don't display image on single post", 'avia_framework' );
		    $id = '_avia_hide_featured_image';
		    $value = esc_attr( get_post_meta( $post->ID, $id, true ) );
		    $selected = !empty($value) ? "checked='checked'" : "";
		    
		    $label = '<label for="' . $id . '" class="selectit"><input '.$selected.' name="' . $id . '" type="checkbox" id="' . $id . '" value="1" > ' . $text .'</label>';
		    return $content .= $label;
		}
		
		return $content;
	}
}

/* 
Make sure the checkbox above is saved properly 
*/
if(!function_exists('add_feature_image_checkbox'))
{	
	add_filter( 'avf_builder_elements', 'add_feature_image_checkbox');

	function add_feature_image_checkbox($elements)
	{	
			$elements[] =  array(
		        "slug"  => "layout",
		        "id"    => "_avia_hide_featured_image",
		        "type"  => "fake",
		    );
	   
		return $elements;
	}
}

The thing is the function to save the checkbox doesn’t work. What should I do? Thanks