This action event can be used to hide a group. Optionally, a transition effect can be used. For example, a group could be hidden by scrolling it out of the visible area of the screen.
When using a transition effect, you can also select the "Merge group objects into single effect" option. In that case all group objects will be combined into a single layer before the transition effect is shown so that the transition effect will be shown on the group as a whole instead of on the group members individually.
Hidden groups can be made visible again by using the Show group action event.