Hi @chrisB ,
The Horizon Theme is still quite new, so official guides might be limited. You can add “Back in Stock” using Klaviyo or a similar app by inserting the code manually into your product or collection template.
Here’s a simple approach:
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Get the Klaviyo Back in Stock code snippet from your Klaviyo account.
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Edit your product template in the Horizon theme and paste the snippet where you want the button to appear.
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Make sure the theme supports product variant and inventory data so the button works properly.
If you're not getting the results you want or aren't sure where to place the code, I can recommend a trusted Shopify expert who’s professional and experienced with custom themes.
Let me know if you’d like the referral!