Description
Icon
When the plan is displayed by day or week, this button allows you to view it view month.
It is possible that the display granularity has been set by default via the checkbox. 
Default granularity of the 
Global configuration
When scheduling remaining work scheduling remaining work displayed by day or week, this button allows you to return to a view .
The last granularity displayed will always be the one displayed on the next visit.
It is not possible to display months over a period longer than two years.
With the view , you can quickly display the current month or the next 12 months by hovering over this line.
It is possible that the display granularity has been set by default via the checkbox. Default granularity of the Global configuration