I figured it out.
The documentation is missing one important step.
Currently it says:
Detail:
Submenu Items 1
Detail / Parent Item: Demo parent menu
Advanced Options / Parameters / Show title: No
Menu Title: Row1 (this is not required)
Columns: 4
Submenu Items 1
Detail / Parent Item: Demo parent menu
Advanced Options / Parameters / Show title: No
Menu Title: Row2 (this is not required)
Columns: 2
But each Submenu Items 1 nee to have the total sumenu width.
Submenu width: total width of all below items
Dear Dirk.
Thanks you for using product our.
I create video, that guide divide row for you. Please refer it. If you still didn't done. You can give me link your site and your account via private message.I will help you.