First, using the search box on the main menu, search for something which will result in Things you would like to save as a list. The results will be displayed in in the form of a list.
To save the search, when viewing the new list, select ‘Edit’ in the top right hand corner. A new screen will appear. Here you will have the options to customize the list, such as changing the list’s title, description, who it’s shared with and it’s theme.
Selecting ‘Save’ will save the search as a list and it will now appear beneath your lists.