All conditions apply for individual columns so you must first select a column by clicking its heading at the Preview panel. The conditions determine how the formatting set through the Editor is applied and also set other formatting.
Click:
•Add Condition to create one that applies to the column generally
•the down arrow against Add Condition and then:
o Add Sub-Total Condition or Add Total Condition to create conditions relevant to the sub-total or total
o Clone to another column to copy this column’s conditions to another column
•to indicate how cells that satisfy more than one condition are to be shown: