Try adding this PHP Snippet:
add_filter( 'generate_element_display', function( $display, $element_id ) {
if ( 123 === $element_id ) { // Only target specific Element
if ( has_post_thumbnail() && get_post_meta( get_the_ID(), '_generate-disable-post-image', true ) === 'true' ) {
$display = false;
}
}
return $display;
}, 10, 2 );
In this part of the code: 123 === $element_id
you need to change the 123
to the ID of the Element. You can find the ID by editing the Element, and checking the URL in the browser.
This will disable that Element if the post has a featured image and the Disable Featured Image option is selected.