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Problem with the size of the images with Lightbox in CMS collection page

Hi everyone,

I’m currently building a website for a food court.
My problem is that I will let my customer add informations and pictures about all the restaurants which are gonna take place in his food court. So I want him to be able to add different pictures of his client meal.
My problem is that I can’t find where to resize automatically the pictures he’s gonna post. What I want is that all the pictures he is going to upload in his CMS collection for each food place to be centered automatically and cut. I want them to all do the same size and not beeing resize.
Thanks a lot for your help !!!

Here is my public share link: Webflow - Paul's LBM Project #2
(how to access public share link)