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I don’t know if I understand your question correctly. From what I understand your game is Landscape but the splash screen is in Portrait?
I wouldn’t know how to solve it without looking at your code or settings in Unity, but as far as I know the Unity logo respects sitting orientation in Edit > Project Settings > Player > Resolution and Presentation. If you have more than one selected it can put as default the protrait, but just for testing go playing with the settings to understand better. Another thing you can do is put a setting like for example "Just Portrait" and rotate the rest of your game with the code:
Screen.orientation = ScreenOrientation.Portrait;
Just put it in any Start in your scripts.
Today you want to kill my answers again? : D I’m going to erase here.
– Maniero