The viewer has an ability to edit elements of a rendered report, such as text fields and checkboxes. To make editing possible, you should mark the components you need as edited in report template. You don't need any additional settings of the viewer. After a report displayed in the viewer, you should click the corresponding button on the viewer toolbar to start editing.

 

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Edited values will be applied when printing or exporting a report and the original report is intact. When the viewer is reloaded all values will be restored to the original.