[Plugin: WP Photo Album Plus] cant zoom

Hello,

I try to find a option to activate zoom for pictures , but I cant find. I saw on wppa homepage, that it works with a small magnifier icon, but in my installation nothing happen.
here you can see

Did I need to install anything more for zoom function, or did I just not found the option in the settings? ?? Maybe you can tell me wich options I need to use. ??

Thank you

https://www.ads-software.com/extend/plugins/wp-photo-album-plus/