Month view : not accurate

In GNOME calendar, when we choose Month to display in the app, we don’t get a month like January or February but 5 weeks beginning with the day initially selected.
At the end, on the main window, we don’t know really which month is displayed !
For example, February is displayed in the left pan and 22nd is selected and… it’s mainly March which is displayed in the main window !
I think that it should be always a complete month displayed in the main window like in Thunderbird for example.