Hello,
In Embedded Wizard there no column configuration for the Vertical List component. Instead you design a component representing the item so that the item has multiple contents arranged like columns. For example, you can create following item containing 4 text views separated by some vertical edges:

Then when you use this component in the Vertical List, you will get some table like appearance:

For more details, let me recommend you the documentation Vertical List. It shows diverse examples where the row contents have multiple columns. For example one column with the name of a song a second column with its duration:

I hope it helps you further.
Best regards
Paul Banach