How do I change previewPath for product template in the theme customizer?

Topic summary

Issue: In the theme customizer, the product template’s previewPath (the URL used to preview a specific product template) points to a deleted product, resulting in a 404 error.

Workaround: Manually pasting a valid product URL allows the user to continue editing the template.

Request: Guidance on how to change the default previewPath for the product template so it doesn’t default to the deleted product and avoids repeated manual updates.

Context: Store Design > customizations. A screenshot is included but not essential to understanding.

Status: No solution or configuration steps provided yet; the question remains open and unresolved.

Summarized with AI on February 5. AI used: gpt-5.

The previewPath for the product template comes up 404 because the product has been deleted. I am able to paste a new path and work with the template, but where can I change this default setting? This is annoying.