In the search panels you might notice some keywords that are suggested. They are manually added and they can be changed in several ways, depending on the header setup:
Try accessing Customizer > Header > Search and look for Keywords text field eg: https://d.pr/i/9TY3vR .
If you can’t see it, it means the keywords are added/overridden in the Search element in the header global section, so you can skip to the next step.
Edit the header global section with Elementor and click on the Search element eg: https://d.pr/i/O3Ryrg . You should be able to see the keywords separated by commas.
In the future i hope to develop some sort of way of automatically detect the most popular searches.