From VFXPedia

Context Menus

There are two context menus in the flow editor where most functions in the flow are accessed; the Tool and the Flow context menus.

Flow Context Menu

Right-clicking on an empty region of the flow will display a context menu with options and functions for manipulating the flow display in general.

Tool Context Menu

Right-clicking directly over a tool in the flow displays the tool's context menu with options and functions that are specific to that tool.

More details on the various options of the context menus can be found at the end of this chapter.