Control-clicking anywhere in the Arrange window, Piano Roll Editor, and all List Editors, opens a shortcut menu (also known as a contextual menu) that can be used for a number of selection and editing tasks.
The shortcut menus differ between (and within) windows, based on both the selection status of events or regions within the window, and also the type of information that the editor deals with.
The items that appear in the menu update to reflect the current context. For example, in the Arrange area:
With no regions or no selected regions in the Arrange window: A number of Select and Paste commands, plus Scroll in Play are available.
With one or more regions selected in the Arrange window: Cut, Copy, and Delete, Nudge, Lock/Unlock SMPTE Position and Region Name and Color commands become available.
Note: You can always access a shortcut menu with a Control-click, but you can also make use of the right mouse button to open it. To do so, make sure that the Right Mouse Button: Opens Shortcut Menu pop-up menu item is chosen in the Logic Express > Preferences > General > Editing pane.