We just added a way to preview your application without loading the custom HTML snippets and HTML elements you have in your app/page. Sometime, custom code can get in the way to change some behaviors, and it’s good to be able to test without removing the elements.
To reach this mode, instead of clicking on PREVIEW, you can hover it for 2 seconds, and then a dropdown will show up. Two options will be shown, the normal one (equivalent to clicking on PREVIEW) and the safe mode one, that prevents the custom code to be loaded. This will help you debug issues when you start adding custom code to your app.