How to open subpages to the side of the parent page?

To open Subpages to the side of the parent page the following steps:

Step 1: Select the "Settings" on the left panel.
Step 2: Click on the "General" tab
Step 3: Turn the "Expand subpages to the side" selector on.

the "Expand subpages to the side" feature can't be used on the next menu types:

• One By One

• Fade-in-Horizontal

• Fade-in-Vertical

• Zoom-in-Horizontal

• Zoom-in-Vertical