SHOPIFY PRINTSTORE DEFAULT VARIANT SELECTOR

I need a modification on my Shopify printstore.
I want the 3rd variant (Large) of every product to be selected by default as soon as the product page loads.
This should apply to all products, regardless of their variant sequence, and across all device types - desktop, tablet, and mobile.
Website.
[login to view URL] Key Requirements.
- Modify the product variant selection process to default to the 3rd variant (Large).
- Ensure this change is effective immediately on page load.
- Apply this to all products in the store.
Ideal Skills and Experience.
- Excellent understanding of Shopify platform, particularly the Dawn theme.
- Proficient in coding and modifying Shopify store settings.
- Previous experience with Shopify variant selection modifications is a plus.
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