How to add more than 21 columns to the data listing page?

How to add more than 21 columns to the data listing page?
At present I can’t see how to add a column past the “U” column (i.e. #21). I need to be able to import data into more than 21 columns.

I’ve searched but I can’t find an answer

Thanks, in anticipation of your help

Kind regards

Steve

Hi,

After saving the design of your listing page, more columns will appear for you to add new fields to the listing page.