Searches, Briefs, Posts and Brain come with Premium, for a site you have claimed.
Searches is part of Premium
Every search Google shows the site for, from its own Search Console: times shown, clicks, place, the page Google shows, and whether a page of its own reads close enough to answer it.
It is part of mttr Premium, for a site you have claimed. Sign in to the account that claimed the site, or claim it.