The Settings sub-option allows you to configure the number of results that are returned per page, whether to display links to the advanced search, result counts, whether to display the sort option, whether the user's OneDrive site is included in the results sources, and whether you want to display ranked or promoted results, as shown in the following screenshot:

For more information on configuring the Search Results web part, see https://support.office.com/en-us/article/change-settings-for-the-search-results-web-part-40ff85b3-bc5e-4230-b1dd-f088188e487e.