If you are using an LQL query to populate the table, then when you first load the LQL query, the Attribute/Action List is populated by a single column set called Default Group. In the Default Group are the metrics and grouping attributes from the LQL query.
For results generated from an LQL query, you can create and rename column sets. You can then move the metrics into your column sets.
To configure the column sets:
The name displays in an editable field.
You cannot remove a column set that contains columns.
The column is copied to the Locked Columns list. Locked columns are not displayed in their column set.
They are only displayed in the locked column section to the left of the table.
The column is copied to the Sorting Controls list.