By setting keys in the Visible track, you may show/hide selected objects temporarily in specific frames. Basically, every object is Visible by default, that is, the key for each object in the start frame of the project is On.
Select the actor and go to the desired frame for hiding.
In the Modify page, scroll to the Display section.
Set the Visible parameter to Off. A key will then be added into the Visible track instantly.
Go to another frame and set the Visible parameter to On. The actor shows and a key is added into the Visible track automatically.
