You have to set timeAxis.minUnitWidth
to a value that would enable you to see the whole data using the display units you have enabled.
timeAxis: {
minUnitWidth: 1
},
This property is undergoing significant rework for the 1.12 version. The intention of the setting is that the chart would never allow a view where each unit (column) is less than what is specified. So you would not have been able to press zoom-out since there are no bigger display unit to switch to. The current 1.11 version uses the setting only occasionally.