In the part of the “Animations” tab reserved to the main menu there are three options: effect, use reverse effect and duration.
Main menu animation configuration
From the “Effect & Duration” parameter you can choose an effect from the drop-down list in order to set-up how the effect will animate on rollover and also set the duration for this effect; the value you insert in the corresponding text field is expressed in frames (thirty frames are the equivalent of one second).
The last parameter here, “Use reverse effect”, adds a reversed effect on rollout, if enabled.