Option to show/hide featured image by post

Thanks Ying,

My point is this: all my post doesn’t have featured image, so, the categories shows the manual extract that I configured with the “read more” tag in every single post over 11 years… yes, I know 😅

If I set the featured image in the customizer, doesn’t show anything in categories (only the title, logically), so my idea is stablish a featured image for each old post, and for the newest, asign a featured image, and delete the in content image to avoid duplicate phothos.

This is te reason of my doubt, if there is an option to select manually wich post can show the featured image.

Thanks!

Thanks Alvind

Finally I find out an automated solution:

With this plugin, I configured the first image at post as a featured image:
https://wordpress.org/plugins/auto-post-thumbnail/

With this filter, overraided the read more tag:

add_filter( 'generate_more_tag', '__return_empty_string' );

Source

And finally, with this, deactivated the excerpt in archive pages:

/*
	Remove excerpts from the achrive pages only
*/

add_filter( 'wp_trim_excerpt', 'db_excerpt_metabox_remove' );
function db_excerpt_metabox_remove( $excerpt ) {
	$output = $excerpt;
	
	if ( is_archive() && has_excerpt() ) {
		$output = '';
	}
	
	return $output;
}

Source

Regards