The Reports view displays report files generated by the Vivado design tools. In the Implementation Run Properties window, select the run, and then select the Reports view to display the list of available report files. Double-click a report to open it.
In the Reports view, you can also specify an existing report strategy. If a user-defined strategy is selected, you can add or remove reports, edit the options for existing reports, and enable or disable reports. For more information, see Creating Report Strategies.
For more information on implementation reports, see this link in the Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906).