Custom field tied to a custom table should show all columns (or selected columns) from the table

We have a custom table with 4 different columns and a custom field (feature level) tied to this custom table to select a value. When I access custom field for selection, it only shows the first column in the table. However, I need to see all columns in that row for me to select the right value.

There is a reason why we create multiple columns in the table and want to see all of the values to select the right value. I am sure it is the case with other Aha! users as well