I don't think you can. The iOS App Store will automatically select the iPad version and run in landscape. With Android there's an additional option in the app settings to switch it from standard (portrait) to Tablet mode (landscape)
I've had similar issues on Android where I've wanted portrait only apps to run in landscape mode. On Android there are apps that can run in the background to force the rotation where the app doesn't support the mode but I don't see similar for iOS.
I don't think you can. The iOS App Store will automatically select the iPad version and run in landscape. With Android there's an additional option in the app settings to switch it from standard (portrait) to Tablet mode (landscape)
I've had similar issues on Android where I've wanted portrait only apps to run in landscape mode. On Android there are apps that can run in the background to force the rotation where the app doesn't support the mode but I don't see similar for iOS.