This can be set in your 3D Window Settings dialog box. Go to pulldown menu View/3D View Mode.
The sun is controlled by 3D projection settings also under View/3D View Mode.
Casey Grimley
AC24
iMac Pro (2017) - macOS 10.14.6- 3.2GHz Intel Xeon W - 32GB RAM - Radeon Pro Vega 56 8GB