To change system options, click
Options 
(Standard toolbar) or .
Use Software Open GL selected
- Turn on:
- High quality for normal view mode
- (Performance Options)
- Turn off:
- High quality for dynamic view mode
- (Performance Options)
- Display shaded planes
- (Display and Selection Options)
- Top/Bottom Gradient colors
- (Color Options)
- Display plane when shaded
- (Sketch Options)
- Shadows
- (Click View Settings
(Heads-Up View toolbar) and clear Shadows in shaded mode)
Use Software OpenGL cleared
- Turn on:
- High quality for normal view mode
- (Performance Options)
- High quality for dynamic view mode
- (Performance Options)
- Gradient (Top/Bottom Gradient colors)
- (Color Options)
- Display shaded planes
- (Display and Selection Options)
- Shadows
- (Click View Settings
(Heads-Up View toolbar) and clear Shadows in shaded mode)
- Turn off:
- Display plane when shaded
- (Sketch Options)