Cms library combine and sort

Hi everyone, I have created a CMS collection call category. Then I have also created two different collection that include a reference field that points to the CMS category collection. I’ve already used finsweet to combine the 2 different collection lists in the CMS category template and i was wondering if there is a way to sort them for example by the field updated on, or if you have any other solution because i’m stack at this point!
is it also possible to show the current item on another static page or CMS template?
Hope someone can help me!
Thank you in advance

Here is my public share link: LINK
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