Before using Natural Language Search (NLS) in Data Visualization, you must enable the
feature in the Site Settings.
Click the Gear icon in the upper right corner to open
the Site Administration menu.
Click Site Settings.
The settings page appears.
Select the following options under Features:
Enable Search - You have to enable this option
for the other two to take effect.
Enable Search in Menu Bar - This option allows
you to open the search modal on any screen from the icon from the Search
button in the top right corner.
Enable Search Visual - This option allows you to
add search visuals to a dashboard.