By Field option organizes each summarized field by field name. It doesn't follow the columns layout.
Image1: Summary Fields Order Interface (By Field).
Enabling "break line per field" checkbox, it will display an unique field per line with selected summarizations (Sum, Average, Max and Min).
Image2: "Break line per Field" enabled.
Disabling "break line per field" checkbox it displays each field side by side.
Image3: "Break line per Field" disabled.
This Settings allows to change the labels of Summarization Types.
Figura4: Edição dos Labels.