Enable or disable animation for the Collapsible Panel widget
By default, when you enable animation
for a Collapsible Panel widget, the panel gradually and smoothly
opens and closes when the site visitor clicks the panel’s tab. If
you disable animation, the collapsible panel snaps open and closed abruptly.
Select a Collapsible Panel widget in the Document
window.
In the Property inspector (Window > Properties),
select or deselect Enable Animation.