Tools can be used to interact or create nodes in the Viewport.
Enable Create Editable Primitives to create Editable Shapes. An Editable Shape is a shape that can be edited with the Edit Shape tool.
When drawing Shapes you can use hotkeys to perform various tasks:
shift to constrain proportions.
alt/option to draw the Shape outwards from the start position of you cursor.
click in the Viewport with a tool selected will create a Shape centered on your cursor.
You can alternatively
alt/option + click a tool icon to create a default Shape.