how to customize site search page?

Hi there,

What would you like to change?

title sizes and colors etc

Hi there,

WordPress adds CSS Classes to the body tag of all pages. The search page has this class: search-results

You can use that to target elements only on that page - for example changing the font size of the H1:

.search-results h1 {
    font-size: 25px;
}

or adding styles to your H2

.search-results h2 {
    /* your styles here */
}

You can also create a Header Element for it by selecting the Search Results display rule:
https://docs.generatepress.com/article/header-element-overview/