How to change screen orientation in Godot with code?

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TL;DR Summary

I need to change the screen orientation using code, but it's not working.

Hi everyone

My app has two mini-games. One uses portrait orientation (which I've set in project settings). The other uses landscape. I need to use code to switch from portrait to landscape. This is what I've tried.

func _ready():
    OS.set_screen_orientation(OS.SCREEN_ORIENTATION_LANDSCAPE)

When I click on the button to run the landscape game, the orientation stays in portrait.

Does anyone know the right way to do this?

Thanks

EDIT:
I've also tried:

OS.screen_orientation = OS.SCREEN_ORIENTATION_LANDSCAPE

This doesn't work either.