The small calendar at the top is used to switch between days. The day has blue font when it contains appointments and is gray otherwise. A blue hue is added in the background of the day proportional to the quantity of appointments. The current day has a green background. The selected day has a black border.
Click 'Add Appointment' to start creating a new appointment with the currently open day prefilled in the new appointment form.
Use the search feature on the top right of the list of appointments to only display rows that contain what you are looking for.
Click a columns name to order the rows of appointments by that column.
The 'Edit Layout' button can be used to reorder the columns and to add or remove columns. When using the Edit Layout you will only be changing your own table for that page and not that of any other user or any other page.