Ok so to display objectives it’s pretty simple. You just need to add the description to the trigger and set it to “yes”. the ‘+’ at the beginning adds a golden checkmark. You can add a ‘-’ instead for a silver circle which usually denotes secondary objectives. Example
As for intro and outro slides, that’s a little trickier, and isn’t done using the scenario editor. I suggest watching Alkhalim’s tutorial on that, as well as looking into other custom campaign files to see how they did it.