Removing items added by Plugin "Add Descendants as Sub Menu items"

I would like to get help from you guys on how to remove or limit the submenus created by the plugin named "Add Descendants as Sub Menu items"

For example:

Menu

Page1

  -> Page1a
  -> Page2a
  -> Others
         -> Page1   - how to remove this? Shouldn't display when hover to Others.

Thank you in advance guys!

Robert