The Settings are a set of properties for controlling selection, editing, and previewing aspects of the Level Editor. These can be accessed in the Level Editor Toolbar.
Allow Translucent Selection
Enabling this option makes it possible to select meshes that are transparent, such as glass objects. Disabling the option can be very helpful in other cases, like in the case of a room filled with translucent particles. Selecting other objects in the room would be difficult otherwise since clicking on the particles would select the Emitter Actor.
Allow Group Selection
If checked, selecting an Actor in a group selects the group instead of the individual Actor.
Strict Box Selection
If checked, an Actor must be completely within the marquee selection box in order to be selected.
Box Select Occluded Objects
When enabled, marquee box select operations will also select objects that are occluded by other objects.
Show Transform Widget
Toggles the visibility of the Transform widget in the Viewports.
Engine Scalability Settings
Provides quick access to Scalability settings that control the fidelity of various rendering features:
Material Quality level
Sets the Material quality level used for previewing in the Viewports. See Material Quality Switch Expression for more information on setting up Materials to work with this setting.
Preview Rendering Level
This sets the rendering level used by the editor.
Controls the volume of sounds from the world that are played when the Viewport is set to realtime.
Enable Actor Snapping
If checked, Actors will snap to the location of other Actors if they are within a specified distance.
Sets the distance Actors must be within in order to snap to one another if Enable Actor Snapping is checked.
Enable Socket Snapping
If checked, allows Actors to be snapped to sockets.
Enable Vertex Snapping
If checked, Actors will snap to the nearest vertex on another Actor in the direction of movement.
Enable Planar Snapping
If checked, actors will snap to the nearest location on the constraint plane. This only works correctly in Perspective views.
Hide Viewport UI
Toggles hidden Viewport UI mode, and hides all overlaid Viewport UI widgets.
Draw Brush Polys
If checked, semi-translucent polygons are rendered for the faces of a CSG brush when selected.
Only Load Visible Levels in Game Preview
If checked, only visible levels will be loaded when game preview starts.
Enable Particle System LOD Switching
If checked, particle systems will use distance LOD switching in perspective Viewports.
Toggle Particle System Helpers
Toggles showing particles system helpers in Viewports.
Freeze Particle Simulation
If checked, particle systems will freeze their simulation state.
Enable LOD View Locking
If checked, Viewports of the same type will use the same LOD.
Enable Automatic Level Streaming
If checked, the Viewport will stream in levels automatically when the camera is moved.