I have a Dell 28in 4K monitor at 3840 x 2160 resolution and a Dell 27 in monitor at 1920 x 1080. Now, my ideal resolution on my 4K would be 2560 x 1440 but for some reason every since I bought the 27 in monitor the 4K will have a black box at that resolution (even though with my 21 in 1920 x 1080 monitor it didn't).

After searching everywhere I just can't find how to run the fullscreen resolution on my 4K (main) monitor, so I read that with DisplayFusion I can adjust the text since my 4K is teeny tiny and my other is huge. I have to use medium icons which make the 1080 monitor crazy big and my 4K is still tiny.

Anyway ya'll can help me get this straightened out will be greatly appreciated. I do have the paid for version of DisplayFusion.

It was everything that was restricted to the area inside the black box. Apps, everything. But I did get it figured out. I tweaked it with my CCC and got it working at my desired resolution.

Good news about Windows 10! I have my copy reserved and look forward to figuring it out.

Thank you for responding.