How Do I Set Up Triggers To Only Be Active In Certain Scenes?

By default, triggers are active all scenes.  This can be changed to allow for similar effects as an override, combined with something that also stop any active running sequence that was run by this trigger.  

If you specify scene validity to a trigger, you are blocking any run of the trigger if the last heard scene for the target specified does not fall in the list of enabled scenes.

To configure this, in the cancel on field in your Triggers section, select "Custom".   

This will bring up a second area where the user can specify which scenes the trigger can be active for, as well as the standard options as to which sequence to run.

Also note that when you view the standard trigger view, your trigger will now show as "Custom" for all fields and you will be required to click through to edit it.