Reports settings let you organize tabular data in a useful form: group results, choose the currency, compare data, etc.
You can specify settings for each report individually and for your whole profile, i.e. for all reports in the Builder.
Settings for a new report you can set in the Builder by the Settings button.
For more information on each setting, see the documentation attachment sections.
Report settings override default settings
Some settings for reports are set by default. These settings are valid for your entire profile: for new reports unless other settings are set in the Builder.
To see and edit default settings, open your profile.