At the top of the calendar preview, you can find three tabs giving you three different options to preview your calendar, either day, week or month.
To show the day in term of hours.
To navigate between days, click the arrows forward and backwards beside the written date on the top left of the page
To show the full weekdays per hour.
To navigate between weeks, click the right and left arrows beside the week number at the top of the sidebar
The default calendar preview to show the full month days.
To navigate between months use the right and left arrows beside the month at the top of the sidebar