Before creating a container, you need to create one or more layers using the View > Layers menu. Make sure to create some simple elements like text, paths, or images as well.

To create a container:

1. Right-click on the PDF page and choose Create > Container.
2. You will be prompted to select all the layers you want to associate with the containers dictionary, which will affect the container's visibility.
3. You also need to select the visibility policy and check all the elements you want to include into the new container. When a container is created, a new dictionary is automatically created as well.

To show or hide the container's elements use View > Layers to change the layer's state to ON or OFF.

To rearrange the container's elements you can right-click to delete the existing container, which will free its elements and create the new one. 

Also refer to PDF Layers.