Managing the Flex UI:
For each added Product the Flex UI allows you to toggle on or off the ‘Panels’ you wish to view in the HTML5 Editor.
Under Product Template Options see the Template Toggles > Flex UI > Hide and show functionally based on your product template options desired for each individual product.
Note: See image below checked in blue for the standard settings PrintNow defaults to be on.
Tip: Restrict New Items if checked will ‘lock’ the template so the customer can’t add new items to the Product.