First thing you have to do, after the first data sync has run successfully, is to go into your Prestashop backend, go to Improve => Modules => Module Manager
Scroll to the bottom and find the Clerk module under other. Click on Configure:
Scroll to Live Search Settings. In that field, you have full control of how many suggestions, categories and pages the Live-Search should display, as seen below.
Choose your settings, scroll to the bottom of the page and press Save
Your changes will then take effect.