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. 

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