How to create onepage menu
First of all, import demo. Please read following link: http://webnus.biz/dox/risotto/#Demo
Every row owns an ID which is the same with the URL menu. For example : URL welcome is equal by #welcome
The ID row which you have designed is welcome.
Please follow below steps:
1 - Click on row setting .
2- From row type , select type blox. ( optional )
3 - In field add your desired row ID.
4 - Scroll down to Page option > onepage menu and CHECK it.
5 - Click on save.
Please check below screen shot:
And update the page.
Now Please go to Appearance > menu
1 - Create a new menu for example onepage menu.
2- Add one custom link and put its url the same like ID row.
3 - Check Onepage Header Menu location
Please check below screen shot :
And I suggest you read the documentation accurately for more information.