To view a live broadcast or VOD on Livestream in full screen on a desktop browser, click on the icon on the bottom right of the player. The player will switch to full screen.
If you are watching a Livestream event via the mobile app for iOS or Android, either tap the same icon in the bottom right of the player or rotate your device from portrait to landscape.
Return to the regular view by tapping the icon in the bottom right corner or rotating your device back to portrait.
If you try rotating and notice no change, make sure your Portrait Orientation Lock setting is turned off.