This article explains how to replace the native search bar in the Ronneby theme by DFDevelopment.
FiboSearch plugin features built-in integration with this theme. It means you can replace the default search bars by selecting a single checkbox.
We currently support only the header type: “Header 10”
If you have activated the Ronneby theme theme or the child theme of Ronneby theme theme, you should see the following screen in the plugin settings:

Select the option Replace them
and the search bar should be replaced.