Watch this tutorial to understand how CoScreen handles sharing between different screen sizes and how you can improve the experience:
When sharing windows from a small screen to a large screen, CoScreen will show it in its true size in terms of pixels. This provides a sharp view with no up- or down-scaling that can cause blurriness.
When instead sharing one or several windows from a large screen to a small screen two things can happen:
A) The shared window are small enough to fit it will be shown in its true size in terms of number of pixels.
B) The shared windows are too large to fit the small screen and will be scaled down so that the full width and height of the larger screens fits within the boundaries of the small one.
CoScreen will always attempt to achieve A first and use B as a fallback. By making the shared windows smaller or moving them closer together you can make CoScreen switch back to option A for a better experience.