Managing Your Work Environment > Setting Preferences > Transition Preferences >

# Attributes

Set the following transition attribute preferences.

Length field
  Set the default length for dissolve and wipe transitions.
Transition Alignment box
  Set the default alignment for dissolves, wipes, axis, and custom transitions to Centred, From Cut, or Up To Cut.
Transition Interpolation box
  Set the default interpolation for transition curves to either Bézier or Linear.