First thing you have to do to change the Clerk Live-Search, after the first data sync has run successfully, is to go into your Magento1 backend, choose SYSTEM in the menu bar and press CONFIGURATION:
Choose the main site (the site you're attempting to affect) under CURRENT CONFIGURATION SCOPE.
Then click on SETTINGS under the CLERK tab in the left side bar:
Scroll down to the field called LIVE SEARCH SETTINGS and select your preferences. Then press SAVE CONFIG:
Your changes take effect immediately.