After the slicing is executed it's possible to visualize the solid in different ways. By default all the solid is displayed, but there are three options for the View Slider.
The picture below show the solid entirely displayed because the view slider is set on "Till Selected" with 107/107 slices selected.

While keeping the "Till Selected" option it's possible to move the view slider up and down to select the desired slice. In the example, we are viewing all slices till the number 68.

In the example we are using the Only Selected method: in this way we are visualizing exactly and only the selected slice (number 68).

The last option of the View Slider is "From Selected": by choosing this all slices will be visualized starting from the one chose with the slider (in the example below we are visualizing all slices from the number 68)