The Zoom Controls area allows the user to zoom in and zoom out in the Gantt chart graphic pane. In other words, it sets the time interval (e.g., year, month, week, etc.).
The Zoom Controls area is made up of three components:
Allows the user to go to the next higher interval.
Level of Zoom
Provides an indication of the current interval.
Allows the user to go to the next lower interval.
Users can click a tick in the middle section to jump to a corresponding interval.