This is awkward... I've got several database views in my Enterprise Geodatabase that I cannot see from my new Desktop 10.4 installation. The 10.3.1 on the desk next to me sees them just fine, as do the 10.1s in another department.
There's still the option to create views, but they are never displayed. Clearly I'm missing a setting somewhere, but what? I can't find any such mention in the documentation.