This
setting will be available if your selected Display mode is ‘Stacked’. If
this toggle is enabled, a ‘Total’ value label will be displayed for the
categories. This label will display the total value of all series or Legend segments
in the stack.
You can
enable and configure total value labels separately from Series Value Labels Defaults. This way, you can apply different customization settings to
visually distinguish it from series value labels, and show neither, both, or
just one or another.
Once
enabled, a new section will be revealed – Series Total Value Labels Defaults
– where you can configure the default settings for total value labels.

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