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Ren here from the Shopify support team. Are you using a Shopify supported theme or a third-party theme? Generally, you can make these sort of adjustments in your sections to the left of the theme editor.
Shop Now is generally a button that you can alter the text to or adjust where the button links. If you'd like a Shop Now button to link to a page with your whole product catalog instead of a specific collection, you'll have to make a collection that contains all products. Linking this up with get you the desired function of the Shop Now button.
Let me know what you think of that option. If I misunderstood, feel free to send back screenshots to help me better understand!