Hiding by default specific post status on backend list?

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It’s not clear what you’re looking for here, but you could try to use the posts_where filter:

/**
 * Remove posts, with a given status, on the edit.php (post) screen, 
 * when there's no post status filter selected.
 */

add_action( 'posts_where', function( $where, $q )
{
    if(    is_admin()
        && $q->is_main_query()
        && ! filter_input( INPUT_GET, 'post_status' )
        && ( $screen = get_current_screen() ) instanceof \WP_Screen
        && 'edit-post' === $screen->id
    )
    {
        global $wpdb;

        $status_to_exclude="project_close";   // Modify this to your needs!

        $where .= sprintf( 
            " AND {$wpdb->posts}.post_status NOT IN ( '%s' ) ", 
            $status_to_exclude 
        );

    }
    return $where;
}, 10, 2 );

where you have to modify the $status_to_exclude status. Here we target the edit.php screen for the post post type. We make sure the post_status GET filter is not set.

So when you click on the All Posts admin menu link in the backend, this filtering is activated.

Hopefully you can adjust this further to your needs.

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