Hello Jacques,
You had a similar issue in the past, here is the topic https://support.metabox.io/topic/dont-know-where-the-settings-are-and-no-longer-working-upon-upgrading/
I already replied to this issue in the ticket system:
I'm not able to edit the theme file on your test site. But I suggest you check two files that get the slider option of the category and show the HTML elements.
/wp-content/themes/thrill/partials/header/title.php
/wp-content/themes/thrill/includes/title.php
or contact your developer who creates this custom theme and ask them to check the issue for you.
Can you please recheck the file that I suggested?