64 bit client UI windows/icons are too big

I run four clients on a 4k TV one client in each corner of the screen. When booting the in game windows/Icons/fonts are huge and I can’t figure out how to shrink them. Its like booting Windows OS with an 800x600 resolution instead of 1920x1080. At this size I could only run 1 client on a huge 65 inch screen which is pretty pointless. Any help would be greatly appreciated. Switched back to 32 bit client until this is resolved.

Thanks