You can switch your calendar between daily, weekly and monthly view by clicking on the rectangular symbols (calendar symbols) at the top of the left column. The symbols look very similar to each other. Tip: When you hover the mouse over one of these symbols, it will show which is the daily, monthly or weekly view.
If you would always like to see a particular view when opening your calendar – either “daily”, “weekly” or “monthly” – you can set this in your account settings.
On this topic, you can also read this help article.