Comments On/Off Switch in the Posts List

add_filter( 'manage_post_posts_columns', function ( $columns ) {
    $columns['wpide_comments_open'] = 'Comments';
    return $columns;
} );

add_action( 'manage_post_posts_custom_column', function ( $column, $post_id ) {
    if ( 'wpide_comments_open' !== $column ) {
        return;
    }
    $open = 'open' === get_post_field( 'comment_status', $post_id );
    printf(
        '<button type="button" class="button button-small wpide-comment-toggle" data-id="%d" aria-pressed="%s">%s</button>',
        (int) $post_id,
        $open ? 'true' : 'false',
        $open ? 'Open' : 'Closed'
    );
}, 10, 2 );

add_action( 'wp_ajax_wpide_comment_toggle', function () {
    check_ajax_referer( 'wpide_comment_toggle', 'nonce' );
    $post_id = isset( $_POST['post_id'] ) ? absint( $_POST['post_id'] ) : 0;
    if ( ! $post_id || ! current_user_can( 'edit_post', $post_id ) ) {
        wp_send_json_error( null, 403 );
    }
    $status = 'open' === get_post_field( 'comment_status', $post_id ) ? 'closed' : 'open';
    wp_update_post( array( 'ID' => $post_id, 'comment_status' => $status ) );
    wp_send_json_success( array( 'open' => 'open' === $status ) );
} );

add_action( 'admin_footer-edit.php', function () {
    ?>
    <script>
    document.addEventListener( 'click', function ( event ) {
        var button = event.target.closest( '.wpide-comment-toggle' );
        if ( ! button ) { return; }
        button.disabled = true;
        var body = new FormData();
        body.append( 'action', 'wpide_comment_toggle' );
        body.append( 'nonce', <?php echo wp_json_encode( wp_create_nonce( 'wpide_comment_toggle' ) ); ?> );
        body.append( 'post_id', button.dataset.id );
        fetch( ajaxurl, { method: 'POST', credentials: 'same-origin', body: body } )
            .then( function ( r ) { return r.json(); } )
            .then( function ( r ) {
                button.disabled = false;
                if ( ! r.success ) { return; }
                button.textContent = r.data.open ? 'Open' : 'Closed';
                button.setAttribute( 'aria-pressed', r.data.open ? 'true' : 'false' );
            } );
    } );
    </script>
    <?php
} );