1) Open wp-content/themes/vertoh/components/templates/widgets/ef_speakers.php
2) Around line number 14, you can find:
$chunks = array_chunk($args[‘speakers’], 4);
3) Replace the above code with
$chunks = array_chunk($args[‘speakers’], 8);
4) Around line number 50, you can find :
for ($i = 0; $i < ceil(count($args[‘speakers’]) / 4); $i++) {
5) Replace the above code with
for ($i = 0; $i < ceil(count($args[‘speakers’]) / 8); $i++) {
6) Save file.