Studio Editor Request: Adding a Preloading Screen

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Currently, it is not possible to add a preloading screen that appears while the site page is loading in the background.
Want a workaround?
While we don't currently offer a built-in solution, one of our Studio creators has shared a way (using code) to add a preloading screen in the Studio forum. 
We are always working to update and improve our products, and your feedback is greatly appreciated.