Watch Multicam with Full Quality (not Draft Quality)

I'm watching 2 cameras in Quad Split, DNxHD 36 on a Nexis storage with DNxIO hardware - and it's only possible in "Draft Quality". Why? 
The performance should be more than enough to watch it in "Full Quality" - would be great to be able to change the "Video Quality Menu" to "Full Quality" when working in Multicam mode or watching footage in Quad Split.