The users are allowed to turn on/off totals in tables and pivot tables.
For straight tables the setting is on the measures. Clicking on the sum-icon (the Greek letter sigma) will activate/deactivate the total for that measure.
In pivot tables the setting is found on the dimensions but works exactly the same.
Note! Totals have to be active in the master item for the option to be available. (This allows the developer to decide where it makes sense to allow totals.)