As mentioned earlier, this is a Windows bug. Custom cursors are not scaled automatically for non HiDPI-aware applications. We are working on a Cubase supporting HiDPI environments but that is a bigger task that won’t happen with a maintenance release. That’s why the honest answer is that it won’t be addressed during the Cubase 9.x life-cycle most likely. However, another option would be that Microsoft addresses this on their end with upcoming releases of course.