Skatter has two modes to generate scattered items: Normal and Render Only
Normal is the default. It will create component instances in the model. Nothing fancy, this is usual Sketchup geometry. To later edit it, right click on the parent group created by Skatter and click on "Edit Skatter group"
Render Only is activated by ticking the "Render only" checkbox below the "(re)Generate" button. When this is activated, nothing will be created in the model, but the information will be handed to the render engines (V-Ray, Thea, Corona, Octane, Indigo, Enscape, Shaderlight, IRender nXt, Twilight Pro, Raylectron and Kerkythea, for now).
This is especially useful when you want to render hundreds of thousands of items without overloading the model.
Since nothing is created in the model with the Render Only mode, if you want to edit the Skatter groups you made, go to the "Render list" tab.