Hi!
Please memorize window scaling. When you change the resolution of the picture, the render window changes its size, it is not convenient.
And it is possible to make the image scale tied to the render window, and it was possible to change the scale from 1-100% (and over), like in photoshop, and not 1:1, 1:2, and so on. In both cases, interactive render and production render.
Thanks.