When you open Phorest Go, appointment slots in Phorest Go are displayed in 1 hour intervals, by default. 

To view the slots in 30 minute intervals, simply zoom in, using your fingers to expand the screen. 

Zoom in even further to display your appointments in 15 minute intervals. 

Please note that when you reopen Phorest Go, appointment slots will be displayed in 1 hour intervals. It is not currently possible to save 30min/15min display settings.