Title bar is displayed above the data visualizer panel:
Title display is the common express report parameter and is specified for all data visualizers.
Example of a table title:
Title contents is determined by the settings of source express report in the desktop application where title parts are presented as tags. If a tag contains dimension element selection, the title displays dimension element name if selection is changed.
To display a title:
Tap the 
button at the top right corner.
In the visualizer's dialog box that opens enable the Title switch button:
To hide the title, disable the Title switch button.
See also:
Table | Chart | Map | Bubble Chart | Bubble Tree | Tree Map