How to enable the experimental flag in shopify
On the Shopify admin navigate to "Online Store" -> Themes -> Customize
In the Shopify theme editor navigate to the product/page/collection where you customiser is currently setup.
Click on "Sign Customiser" app block to bring up its settings.
Make sure "Use Experimental Features" is ticked.
Click on "Save" in the top right corner to apply your new theme settings.
How to enable the experimental flag in our universal app or iframe embed
To enable experimental features using our iframe, update your iframe source to include the ?experimental=true query string parameter.
For example:
https://web.signcustomiser.com/embed/xxx?experimental=true
Or if there are other query parameters already present you can append it using an &experimental=true
https://web.signcustomiser.com/embed/xxx?initial_screen=VISUALISER&experimental=true