A full week’s overview (like the one you can view on a computer) isn’t available on a phone or tablet - on these devices, only the day view is available, so navigating the calendar and managing bookings stays as clear and comfortable as possible.
The only way to see a full week at once on a smaller device is to change your web browser’s font/zoom size (from 100% down to about 50%, depending on the device). If you turn your phone sideways, a smaller change is enough (from 100% down to 75%).