There is a ? on the Home Page under a photo

sadly the topic is closed: . https://kriesi.at/support/topic/search-function-with-link-list/

what i got so far:
https://enfold.webers-webdesign.de/pages

this is only for pages ( if you like to have that for posts – just change the post-type )
i managed it by a custom shortcode – then place this as : [glossary] on your page

function az_index($post_id) {
    $AZposts = get_posts(array(
        'numberposts'       => -1,
        'post_type'         => 'page',
        'orderby'           => 'title',
        'order'             => 'ASC',
        // 'category'           => $cat
    ));

    $current = "";
    $nav = "";
    $postlist = "";
    foreach($AZposts as $AZpost) {
        $postLink = get_permalink( $AZpost->ID );
        $firstletter = strtoupper(substr($AZpost->post_title,0,1));
        if($firstletter != $current) {
            $nav .= "<span class='firstletters'><a href='#$firstletter'> $firstletter </a></span> ";
            $postlist .= "<h3 class='firstletter' id='$firstletter'> $firstletter </h3>\n";
            $current = $firstletter;
        }
        $postlist .= "<span><a class='postlink' href='".$postLink ."'>" . $AZpost->post_title.  "</a></span><br>\n";
    }

    print $nav . "<br><br>" . $postlist;
}
add_shortcode( 'glossary', 'az_index' );

and :

.firstletters {
  padding: 0 10px ;
  background: #900;
  margin-right: 5px;
  display: inline-block;
}

.firstletters a {
  color: #FFF;
  text-align: center !important;
}

i tried to have unordered list after the h3 headings – but i couldn’t find a way to do that ( loop is hard to find the place to insert that tags ) – maybe a mod got a good idea