To rebuild the report at any time to get the latest traffic information, click on Rebuild New Data on the top left of the screen. This will rebuild all the data since the last build, for which the frequency of the build is controlled on the Scheduler (Build Shopping Feed Data Daily).
Below this link, is a link to rebuild all history. Clicking on this is only necessary if you have changed your category mapping recently to reflect different shopping comparison rates. Clicking on this also can take considerable time to process. This will also erase any data from all reporting older than 30 days. This can not be undone.