Hi Alain,
at the moment it is not possible to deactivate the slideshow on mobil devices.
But we are already working on a update of the Bakground slide show and we will add this feature. But this will take 1 or 2 working days. We will contact you asap if the new version is available.
I hope my answer was helpful.
If you like our tools and Service, feel free to write a review in the JED.
Best Regards
Caro