Start the game with the screen in landscape mode

Hello, I am developing a mobile game and I want the game to start in landscape mode. I don’t want to lock screen rotation to landscape, I just want my game to start in landscape mode. If anyone can help me with this problem I would appreciate it.

I tried putting this line of code in the game configuration:

orientation: Phaser.Scale.LANDSCAPE

I tried other ways too, but none worked.

I don’t think that’s possible.