The ‘blur’ is more likely due to the fact that for Unreal or any program to wirelessly connect to an ipad (or any wireless device for that matter) it has to highly compress the video. This is usually necessary in order to have smooth playback which is usually more important than the image being a little blurry. I am only guessing because this is only generally the case; maybe there’s something in the settings that you can change. But remember that using an ipad as a monitor is there mostly for practical purposes - like framing a shot , dialing in the virtual camera settings, and gauging whether or not you set up the virtual world in relation to your real world settings correctly - for starts. In other words take advantage of tools like that for what they are meant for, we can only expect so much before we get into high budget sets with a lot of dedicated equipment