The following menus are available in the 3D scene editor's main window...
Edit Menu
Undo - Reverses the most recent change that you have made.
Redo - Re-applies the last change that was canceled with an 'Undo'.
Cut - Copies the selection to the clipboard, and removes it from the workspace.
Copy - Copies the selection to the clipboard without removing it from the workspace.
Paste - Copies contents of the clipboard into the current workspace.
Duplicate - Replicates the current selection.
Remove - Removes the current selection from the workspace.
Edit Scene Script - Allows you to edit the top level script in the scene.
Scene Properties - Opens a dialog that allows you to configure various settings for your scene. (See 3D Scene Properties for more information).
View Menu
Overview - Zooms out all windows to show the entire scene.
View Selection All - Zooms all windows to show the current selection.
Select All - Selects every top level object in the world.
Select None - Deselects every top level object in the world.
Lock Selection - Will not allow a selection change until this option is turned off.
Restrict Mouse To X - Only horizontal movement of the mouse will be used.
Restrict Mouse To Y - Only vertical movement of the mouse will be used.
Insert Menu
Clicking any of these options will create an object in the scene of the selected type.
Format Menu
Make Group - If you have selected several objects, this option will put them into a single group that you can move and transform as one object.
Break Group - If you have a group selected, this reverses the Make Group operation.
Align - Aligns the selected objects along the specified side.
Space Evenly - Distributes the selected objects evenly.
Centre On Axis - Aligns the selected objects such that they are centred on the specified axis.
Tools Menu
Edit XML Source - Allows you to edit the source code that defines the scene. This is an advanced feature that gives you full control over your data.
Media Playlist - Add and remove audio/video files that will be played in order.
Window Menu
Default Layout - Resets the position and size of all of the property windows in the scene editor.