PenciDesign Supporter replied
Hi,
The search form shown in your screenshot is part of the default header layout, while your site is using a custom header layout built with the Penci Header Builder. As a result, inline search is not supported—only dropdown and popup search styles are available.
If you would like to use this search style, you will need to switch back to the default Soledad header by going to Appearance → Customize → Logo & Header → General.
Regards,
PenciDesign.