I was able to find a solution here.
Topic summary
Main issue: After upgrading to Dawn 15.2.0, sold‑out variant “pills” (the clickable buttons for options like size/color) display a strikethrough. The goal is to remove the strikethrough while still allowing selection of sold‑out variants to enable a back‑in‑stock (“Notify me”) flow.
Context: The previous Dawn 2.0 didn’t show the strikethrough. A screenshot was shared for visual reference.
Process: A helper requested a proper preview/public URL after an admin link was posted. The public storefront URL was then provided. It was noted that adding a “Notify me” feature typically requires additional coding or an app and may need developer support.
Outcome: The original poster located and used a solution from another Shopify forum thread (link provided). No code details were shared in this discussion.
Status: Resolved for removing the strikethrough styling. The “Notify me” functionality remains unimplemented in this thread and may require separate development or an app.