With the planning view
Open your program, go to the "Sessions" tab, and visualize at a glance all your planned and past sessions.
Use the timezone list to visualize your planning in another timezone.
With the list view
You can also view sessions via the list view.
Just switch views thanks to the dedicated button, next to the "Schedule a new round" button.
You can also view all your sessions of all your programs in the "Planning" section of the "Programs" panel.