tacit crescent
I've had similar issues with both previous betas and alphas where the game will not scale correctly to the screen if the windows scaling is not set to 100% which is a big issue a lot of displays' defaults aren't 100% scaling. Alt tabbing in and out of the game while on full screen causes a lot of flickering and makes interacting with other windows a lot more difficult as compared to the borderless mode.
example of the scaling issue on a 1440p display at 125% scaling
gleaming summit
nocturne patrol