Why do I need the preview in Designer?
As a creator, you'll soon look at your smap in a users point of view.
The preview is perfect for this.
You get a working version of your current editing status displayed on a mobile device with smapOne app. Logics and other formulas also function in this preview and can be tested without having to release the smap yet.
A working internet connection provided, any changes in Designer are also added and reloaded directly in the preview.