Search Results layout in Search layouts is used to display fields for users in search results.

If the user’s profile has “Customize Application” permission, then the user can edit Search Layouts.

Sample search result:

When editing a search results layout
for an object, you can select the Override the search result
column customizations for all users checkbox. If selected,
all user column customizations within your organization will be overwritten
and set to the organization-wide default settings.