When this feature is Enabled, the plugin will try to load the results - without reloading the results page.
General Options -> Logic & Behavior (scroll down)
Default value: #main
This is the selector that the script tries to match, when the new results page is loaded via AJAX. The script then replaces the old content within this selector with the new ones.
If you are not a developer, your best bet is to ask the author of your current theme, he might know how to get the selector to target the results page container.
You can also contact us via support, we might be able to help - but please note that we cannot guarantee this feature to work correctly in every case.
The only possible way is using the browser developer console or via the page source. Unfortunately there is no guide we could provide for this, as it would exceed the contents of this documentation.