The page is available only when the PHP plugin is enabled. The plugin is not bundled with IntelliJ IDEA, but it can be installed from the JetBrains plugin repository as described in Installing, Updating and Uninstalling Repository Plugins and Enabling and Disabling Plugins.
On this page, specify the scripts requests to which you want IntelliJ IDEA to ignore during debugging.
This approach can be useful, when your application contains scripts that use AJAX. Suppose you have a
menu-ajax-script.php that "reloads" a part of your web page.
This script works properly so you do not need to debug it. However, this script is still requested during the debugging session. To have incoming connections to this script ignored,
menu-ajax-script.php script to the skipped paths list. You can also group such scripts into folders and add these folders to the "ignore list".