This article explains how to change the appointment calendar view to show more detail by default
Click on Manager, then Settings
Click on Point of Sale then Device
At the bottom of the screen, choose the Granularity that you would like your appointment screen to default to. The choices are 5 mins, 10 mins, 15 mins, 20 mins, 30 mins, or 60 mins. Click on Save
Note: You will need to restart Phorest for this change to take effect.