The page is available only when the PHP plugin is enabled. The plugin is bundled with PhpStorm and activated by default. If the plugin is not activated, enable it on the Plugins page of the Settings / Preferences Dialog as described in Enabling and Disabling Plugins.
On this page, specify the scripts requests to which you want PhpStorm 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".