Search and Filter Pro
Search and Filter Pro is a great plugin to add a more robust search to any WordPress site. I find it’s best if I set it up to use a custom archive template for displaying the results Instructions are here: https://searchandfilter.com/documentation/search-results/as-an-archive
With a custom template, I have more control of the way the result page looks and it avoids any conflicts if I’m already using pre_get_posts arguments (for example to order the posts by title)