Logo & Search

Have you tried adding the search widget into the header widget area in "Appearance > Widgets"?

This worked! Is there a way to position the search box in the center?

Like

Logo - Search Box - Something else

Hi John,

You would have to rebuild the header using GP's Before Header Content hook and split it in 3 parts:
https://docs.generatepress.com/article/hooks-overview/

Try adding something like this:

<div class="grid-33 header-left">
    <div class="site-logo">
        <a href="URL TO YOUR WEBSITE" title="YOUR SITE NAME" rel="home">
            <img class="header-image" src="URL TO YOUR IMAGE" alt="YOUR SITE NAME" title="YOUR SITE NAME">
        </a>
    </div>
</div>
<div class="grid-33 header-center">
    Search widget shortcode here
</div>
<div class="grid-33 header-right">
    Header right content
</div>

Then you can use a a plugin like this to turn search widget into a shortcode and add it in:
https://en-ca.wordpress.org/plugins/widget-shortcode/

Let me know if this helps.