This article explains how to replace the native search bar in the Sober theme by uixthemes.
FiboSearch plugin has built-in integration with the Sober theme. It means you can replace the default search bar by selecting a single checkbox.
If you have activated Sober theme or child-theme of Sober, you should see the following screen in the plugin settings:
WooCommerce -> FiboSearch -> Starting (tab)
Select the option “Replace all Sober search bars with the FiboSearch.” and the search bar should be replaced.
This integration also works form mobile version.