You can select elements you've instantiated by dragging and dropping them from the library onto the stage in two ways:
- Directly clicking on the shape, on the stage.
- Clicking on the shape's name on the timeline's properties panel. This is very useful when you have multiple slices on the stage, especially if they are stacked.
TIP: You can lock layers by clicking on the [lock] icon below the asset's name in the timeline. This also disables all "pointer events" on that element.