How to display the intersection of my collections in a gallery (using a site menu)?

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So first get all the items from the datasets:
https://www.wix.com/velo/reference/wix-dataset/dataset/getitems

Once the user selected filter(s), use filter the dataset based on brand and/or type:
https://www.wix.com/velo/reference/wix-dataset/dataset/setfilter