How to design a new screen to open?

Is there a tutorial in how to make a watch that opens a second screen to change the watch face? This is hard for me to explain. Here is a link to a watch that has what I am trying to describe.

. B# - Modern Masterpiece • Facer: the world’s largest watch face platform

Don’t know if there are tutorials, but this is it in a nutshell:

  • You need creator Pro to use vars.
  • You add a “VAR toggle” to the watch (assuming VAR_1 here).
  • On the layers you want to show/hide you add something like this in the opacity field:

Tapping the area will make VAR_1 0 or 1, which changes the opacity between 0% and 100%