Changing ong the theme

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I currenty have the Supply theme for my store @ and have done some custom work and had a Shopify expert add something and im not sure if they added it to my store alone or updated the entire theme. At first if i had multiple sizes and options it would show all the photos on the product page cluttering the page and had them add the option to hide all the photos and only show single photo when a certain item is clicked on. How do i find out if ill lose the part of the code
Shopify Partner
471 65 83

Hello, @223DigitalArt 
Do you mean like this?Men's Graphic Tee's - Jet T-Shirt (Reg Fit) _ .223 Digital Art.png

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