Hi there,
you can use a Hook Element:
https://docs.generatepress.com/article/hooks-element-overview/
For that position you would want the after_logo
hook
And this Code to output title and first category term:
<div class="navigation-title-container">
<div class="navigation-post-title"><?php the_title(); ?></div>
<div class="navigation-category">
<?php
$category = get_the_category();
echo $category[0]->cat_name;
?>
</div>
</div>
And this CSS to display it on Sticky only:
.sticky-enabled .main-navigation:not(.is_stuck) .navigation-title-container {
display: none;
}
This applies to the Navigation as Header option.
You can of course hook it into other places – if your using the Mobile header for example you can use the inside-mobile-header – the CSS would need updating to suit.