Typeahead search makes it faster and easier to find the fields you need by enabling you to pull up a list of relevant fields by typing instead of dragging and dropping.
This expedites the process of building a visualization, especially when working with wide datasets or those that contain similarly-named fields. (For example, you may have many fields that contain the word "Account", like Account ID, Account Owner, Account Status, etc.).
To use this feature, click 'Add fields here' in the Columns or Rows dropzones and begin typing. You can also tab between Columns, Rows, and Filters to create visualizations without using a mouse.