Hi,
The screenshot is available via link https://yadent.ru/images/IMG_5208.png
The vertical divider cannot be moved.
Before&After Addon is on the page https://yadent.ru/service/restavratsiya-zubov-keramicheskie-viniry
You can check it by yourself.
In the mobile version <div class="sppb-before-after-image sppb-image-before sppb-before-after-image-horizontal"> does not have style="width:..." and <div class="sppb-before-after-separator sppb-separator-horizontal"> does not have style="left:..."
Joomla 4.4.0,
SPPB 5.1.7 PRO,
Helix Ultimate 2.0.17,
php 8.2.9
Regards.