21:9 support?

I have been unable to get AOE: DE to go full screen on my monitor, which is an Acer x34 3440x1440

I believed the game would support ultrawide resolutions, could anyone clarify this please?

@FilthySlippers The game adjusts to your screen (desktop resolution) but currently the game supports 4K resolutions not ultra wide.

When you start playing the game, it should cover the entire screen.
However, the Main Menu will not stretch to the 21:9 aspect ratio, and that’s by design.

@FilthySlippers You learn something new every day I apologise for my mistake.