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I have a quick view modal for all products on my website. How should I deal with these in the page set up eg. should I rel=canonical to the full product page and no-index in robots txt or are they ok in Googles eyes as they are part of the UX ?

The website I'm working on has no canonical tags. There is duplicate content so rel=canonicals need adding to certain pages but is it best practice to have a tag on every page ?