This is a sticky product effect when you scroll the page. Navigate to Theme Settings > Single Product > enable the option Sticky Product.
If you turn on this option, the section with description will be sticky when you scroll the page. In case when the description is higher than images, the images section will be fixed instead.
Hola, pero el efecto del tema “Demo Mega Electronics” no mantiene la sección con la descripción fija, lo que
mantiene fija es la imagen. He activado la opción que indicas y no tengo ningún efecto.
Hello, but the effect of the “Demo Mega Electronics” theme does not keep the section with the fixed description, which
keeps the image fixed. I have activated the option you indicate and it has no effect.
Sorry to hear about the inconvenience. Kindly, please share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.