When the Common Library is open in the Project Properties window, you use the Projects List pane to select the Projects in which you want to enable the Common Library file that is active in the Project Properties pane.

You can click the Select All button or Clear All button to select or clear all Projects and then customize your selections from there. For more information, see Enabling Files from Properties for the Common Library.

When a file in the Common Library file is enabled in a Project, it is shown in all file selection lists, including those in the Project Navigator, Project Properties window, and relevant Open windows.

In a standard Project, the names of enabled Common Library files are preceded by (Common) to distinguish them from the files in that Project. When you create a Project, all files in the Common Library are enabled in this new Project by default.