Dawn Theme - auto-open first collapsible row

Store Design
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Topic summary

Main Issue:
Users want to automatically open the first collapsible row on product pages in Shopify’s Dawn theme by default.

Working Solution (Dawn Theme):
GemPages support provided a step-by-step code modification:

  1. Edit main-product.liquid file
  2. Add {% if block.settings.open %} open {% endif %} inside the <details> tag where collapsible_tab is found
  3. Add a checkbox setting in the schema section to control the “Open by default” option
  4. Enable the checkbox in the theme customizer under Product settings

Implementation Notes:

  • Multiple users confirmed this works for both Dawn and Craft themes
  • Common mistake: Incorrect placement of the > character causes “open” text to display instead of actually opening the row
  • For Craft theme: The collapsible_tab code is located around row 780

Unresolved Questions:

  • One user reports the Craft theme already has an open_first_collapsible_row checkbox in the code but it doesn’t appear in the admin interface
  • Request for similar solution for Prestige theme (unanswered)
  • Question about adding a ‘Read more’ feature to the opened collapsible content (unanswered)
Summarized with AI on October 30. AI used: claude-sonnet-4-5-20250929.
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Hi! Is there a way to add a ‘Read more’ for the description inside the first collapsible row, which is open by default?