FiboSearch plugin (since version 1.11) has built-in integration with this theme. It means you can replace the default search bar by selecting a single checkbox.
If you have activated Top Store or Top Store Pro theme or child-theme of them, you should see the following screen in the plugin settings:
WooCommerce -> FiboSearch -> Starting (tab)
Select the option “Replace all Top Store search bars with the FiboSearch.” and the search bar should be replaced.