In the Search tab you can set specific parameters for Quick Search and Advanced Search:

search, img #01.1

Note: In Quick Search, 'Path to search on' parameter will be ignored if Solr is enabled and we will then only set the 'Data to search on' as; File names, or All fields.

search, img #01.2

Once you are done, press Save to return to the Sites menu or hit Apply and go to the Next tab.