Closing lightbox on out of picture click

Referring to this resolved topic

Hi I noticed that the class-fire-ressources.php has been changed recently, so the above explanation doesn’t work anymore since ‘overlayshow’ isn’t in there anymore. ( if you’ve done the above in a child theme, the entire lightbox effect is gone and images just open in the active window )

So where to add ‘hideOnOverlayClick’ now ? I can’t find a nice place of it in the new css.