[misionis]

Thank You.

[misionis]

Thank You very much for Your answear. The problem is I'm not a php developer and my skills in it are at the beginner level.

But I've found the solution that works fine. Maybe someone will have similar issue, so I pase it below. Regards.

function is_tree($pid) {      // $pid = The ID of the page we're looking for pages underneath
    global $post;         // load details about this page
    $anc = get_post_ancestors( $post->ID );
    foreach($anc as $ancestor) {
        if(is_page() && $ancestor == $pid) {
            return true;
        }
    }
    if(is_page()&&(is_page($pid))) 
               return true;   // we're at the page or at a sub page
    else 
               return false;  // we're elsewhere
};

add_action('get_header','ms_change_sidebar');
function ms_change_sidebar() {
    
    if ( is_page( 'baza-wiedzy' ) || is_tree('18') ) { 
        remove_action( 'genesis_sidebar', 'genesis_do_sidebar' ); 
        remove_action( 'genesis_sidebar', 'ss_do_sidebar' ); 
        add_action( 'genesis_sidebar', 'dodaj_sidebar_wiedza' ); 
    }
}

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