The CGX app will open in portrait mode by default, and videos will always play in landscape mode. But, you can use the entire app in landscape mode by using your iPad's Screen Manager tool.
- Open the Settings app on your iPad
- Tap into the Multitasking & Gestures menu
- Now turn on Stage Manager
- Open the CGX app
- At the bottom right corner of the app, you'll see a rounded corner outline. Pull slightly upwards on this corner then let go. This will make the CGX app slightly smaller on your screen.
- Now tilt your iPad screen. The CGX app will tilt with you and display horizontally.
Read more about Stage Manager on Apple's website: Organize windows with Stage Manager on iPad.