Click the Map actions button to open the map options menu.
Click the Edit details button to open the map editing interface.
Click DATA.
Click the Attributes button for the layer you wish to configure.
Click the toggle button beside the attribute you wish to show or hide.
Toggling 'Click' will toggle the entire attribute from showing on the feature popup. Toggling 'Title' will toggle just the attribute title from showing, however the data for that attribute will still be shown.
Click the HOVER button to configure the Hover attributes.
Click the toggle button to toggle the attribute on or off.
Click the 'Save Changes' button to save the current attribute configuration settings.
Now when you hover over a feature it will display the attribute(s) that were enabled for hover.
And when you now click the feature and view the popup it will show only the attributes that were configured.