As you may know from the previous post about JavaScript libraries in PhpStorm & WebStorm, the main benefit of specifying JavaScript libraries in your project is to populate a completion list with only relevant members. We have reorganized the configuration panel at Settings|JavaScript|Libraries, so it hopefully become easier to use.
If you simply want to select a library for the whole project, check the corresponding box. For more complex library scopes configuration, click Manage Scopes... button.
Also, for per-file scopes settings, you can use JavaScript file context menu trigg