[SINCE Orbeon Forms 2020.1 and 2019.2.3] The following property allows you to configure whether the Summary page shows data:
if set to true: for one version at a time, which is the default;
if set to false: for all data across form definition versions, as it used to be the case up until Orbeon Forms 2018.1.
Even when set to false, if the form-version request parameter is passed to the Summary page, it will not ignore the request parameter and will only show data created with that version of the form definition.
[SINCE Orbeon Forms 2023.1] When the property is set to false, links to the Summary page from the Published Forms and Landing pages will not include the form-version request parameter.