Different resolutions on wide monitor

I’m using 21:9 ratio monitor and playing DE.

But it’s too wide to move mouse cursor to edge of left or right to scroll camera.

So I want to play it 16:9 resolution (cut sides, no shrink) but it does not support other than 21:9 res.

Hi @SeniorLee, Are you referring to Age of Empires: Definitive Edition or Age of Empires II: Definitive Edition?