I see this Tab on my Asus Notebook and I can change it to custom resolutions. (In the end it didn't work either because it said wrong resolution, but that's a different topic. I was glad i have a Nvidia GPU in my Notebook too)
On the NUC this tab doesn't exist in the newest drivers. I tried an old driver, which supposedly the "custommodeapp.exe" should be workin, without any luck.