DPI scaling raises the minimum required resolution. At 100% scaling the minimum resolution is 1440×900, but at 125% it will be 1800×1125.
By design, most of the game windows do not resize at all. You can't make them larger to take a larger portion of the screen, or size them down to make them fit on a smaller screen. AuroraMod overrides this, but the result is not very amazing. Windows that are smaller than they need to be simply gain an extra scrollbar that allows you to scroll down or over to the parts of the window that would otherwise be inaccessible.
To have better chance of figuring out what is going wrong on your televisions you will need to take screenshots. Not photographs, but proper screenshots. Your description of the problem actually sounds rather backwards. DPI scaling makes the windows smaller? That doesn't make any sense. Perhaps the window has stayed the same size, but the controls inside it have been scaled up. That would be an unusual result, but I don't think it's actually impossible, and it would definitely be a bug in the game. The DPI settings are supposed to be handled either by Windows in a manner which is transparent to the game, or by the game in a manner that tells Windows not to do anything. It's possible that the game has told windows that it will handle the scaling, but that it fails to scale the window sizes that it requests. Many years ago I had to read a very long MDN article that explained all the technical details, and I recall that those details can indeed be complicated. Worse, the results can depend on the setting of some checkboxes buried in the Visual Studio settings for your project.