To hide filters from the Search Results Widget, follow these steps:

  1. Go to Searchanise (Smart Search & Filter) control panel > Filters section > General tab.
  2. Click the Edit filters button in the top-right corner.
  3. Change the filter's status from Active to Hidden. 
  4. Save the changes.

That's it. You can go to your storefront and make sure the filters are hidden in the Search Results Widget.