Each XR+ project is made of one or several scenes, on the basic plan your have have up to 5 scenes, but this limit is raised to 10 or more on the advanced and expert plans.

Each scene is independent, you can setup actions to switch between scenes, take a look at the bird slideshow template for an example of a multi scene project

Open template

You can activate the timeline on the scenes to setup in & out timings for each of the scene items