Search input in Drupal 8
You need to create a view page, and in the FILTER CRITERIA you can add "for example" : content datasource:title and add the title of this specific page if it will not change
But the best is to use : ID = nid that you will find in your database in the
node_field_data table
Search for the title and you will find your ID and use it to filter in your views and that's it !