The following keyboard and mouse shortcuts make it easier to zoom and pan the scene.
Note. The scene must have focus for these shortcuts to work. Be sure to click somewhere in the scene before using the shortcuts.
Open and save files
Ctrl-O
open file
Ctrl-S
save file
Zoom and pan the scene
Arrow keys (left, right, up, down)
move the scene
I
zoom in (make objects bigger)
O
zoom out
C
center the scene
Z
change to elevations view
T
change to bird's eye view
S
change to 3D scene view
drag (mouse)
rotate scene (3D scene view only)
Shift-drag
pan scene
Ctrl-drag
zoom scene