Preferences window

General

Resolution: sets the size of the main editor window. Needs restart.
Max undo steps: modifies the number of steps that can be undone/redone in a session.
BG color: changes the color of the viewport background.
Disabled entity coverage: determines how “transparent” a mesh becomes when disabled (only for entities)

Texture quality: changes the quality for the texture mapping on objects. Possible values are: high, medium, low, very low. Needs restart
Lights active: turns off all ligths in the scene, except for the edition helper ones (ambient and point)
Particle systems active: turns off all particle systems in the scene.
SSAO active: toggles showing of SSAO.
Undergrowth
- Show undergrowth: toggles showing of undergrowth on terrain. The undergrowth will still be there, just not shown.
- Custom undergrowth fade start: sets a custom range for the terrain undergrowth to show.
Show skybox: toggles showing of skybox.
Show fog: toggles showing of the global fog.
Continuous rendering: sets if the viewports should be refreshed continuously or only when needed.