How to adjust the width of the subpages?

To adjust the width of the Subpages the following steps:

Step 1: Select "Settings" on the left panel.
Step 2: Click on the "General" tab
Step 3: Turn the "Expand Subpages to the side " selector on. 
Step 4: Adjust the "Width of Subpages"

To Adjust the width of the subpages relevant only for Subpages that opened to the side of the parent page.

The feature can't be used on the next menu types:

• One By One

• Expand-in

• Wave-in

• Fade-in-Horizontal

• Fade-in-Vertical

• Zoom-in-Horizontal

• Zoom-in-Vertical