Low rendering resolution in Layout - Windows 10

In OpenFOAM I am running a model that looks at the cooling down of an ellipse in a volume of water. After I open the model in Paraview the rendering resolution in the Layout box is not smooth and changes as I reorient the view. I went into ParaView properties and changed checked the box for “Override” and changed the drop down menu to “System(enhanced)”. Current native Windows size of text, etc is at 125% recommended and display resolution is 1920 X 1080(recommended), Landscape orientation.

I then changed my size of text, etc to 250%. It is not letting me change my resolution to 3840 x 2160. Now, I got this image:

Is there any other specs I can change to get a better resolution?