[Plugin: FancyBox for WordPress] FancyBox in the code

Hi guys,
I’ve installed a theme called Adana and it’s not working properly. They guy who created tell me that: “It looks like you’re referencing the “FancyBox” plugin somewhere in your code – this could potentially be causing a conflict with other plugins which could explain why the large screenshot is not being displayed”. Please, how can I remove Fancybox from the code?
Thank you

https://www.ads-software.com/extend/plugins/fancybox-for-wordpress/