Réponse sur le forum: https://www.phoca.cz/forum/viewtopic.php?t=63444

Hi, generally, the problem with slideshows is, they are mostly not responsive or have problems when displayed on responsive websites. The update of plugin did not get high priority, because mostly such type of slideshow was abandoned and standard plugin with e.g. popup slideshow is used.

You can see it e.g. on this demo:
This is Phoca Gallery plugin for Joomla 4 and when you click on the image, Photoswipe popup is displayes where users can run the slideshow:

https://www.phoca.cz/demo/phocagallery-plugin

So if there is a demand to display slideshow directly in articles then completely new slideshow Javascript library needs to be found, because the old one does not meet criteria for modern website.