The main canvas is where all the Processes (Functions and Types) and Services that form part of a Solution are placed. Once a component is placed on the canvas its properties can be set to determine the way in which it will function.
To place a Function, Type or Service on the main canvas: click-drag-and-drop the component from its default location onto the main canvas. The default location depends on the type of component being added to the solution. Components are typically located on the right of the screen in the Plugins section.
The main canvas can contain one or more tabs. Tabs can be closed individually, but all tabs can also be closed at once by using Windows > Close All Tabs from the top menu bar.