In the theme editor (Customize), open the template selector.
Select Search.
On the left-side bar, select Search results.
Make necessary changes > Save.
Section settings
You can add any section available in the theme sections. However, there are two sections designed specifically for the Search page, including:
Search
Search results
You can also make basic layout adjustments for the Search page through the settings of these two sections.
In the settings of the Search result section, you can also turn on and control Filtering & Sorting, in addition to the basic settings for adjusting the layout of the section.