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Redesign of Shopify theme editor built in React
Effective September 22, 2020
The theme editor has been rebuilt in React and includes an updated mobile theme editing experience and many UI enhancements. The rebuild also decreases load times for large themes, making it easier and faster for merchants to set up and customize their online store, while also laying a new foundation for future improvements to the theme editing experience.
To learn more about the new theme editor, please visit the Shopify Help Center.