Hello again!
Today, when I tested the mobiles - Android, iOs and Harmony (EMUI 12), it worked to hold down your finger for about a second to be able to bring up the style without the lightbox appearing. Before that, it was enough to just slightly touch the image and the lightbox started.
So now everything seems to work. But I still wonder if it is difficult to remove the display of the lightbox for the mobiles.
Thank you for your consideration,
Benke