The canvas is the point and click design space in the module editor [?]
The "Module Editor", also known as the "Visual Editor", is an interface used to create & modify modules.
It's through this interface you can add various types of layers to your modules, as well as animation and special FX.. It forms the largest area of the module editor.
In this area layers [?]
Layers are containers for visual, audio or layout items and are added to slides. For example, text, button, image, audio, video, group and row are all types of layers.
Layers are added to slides via the module editor. can be selected, moved and resized. Animations can also be previewed.