Can I change the time period that the figures reflect on the Intelligence reports?

For the Executive Summary, you can use the drop down menu to change the time period ranging from years right down to days. 

For the Detailed Reports, if you select the specific points or bars on the graphs then this will filter the data in the attached tables to reflect this. If you want to clear this filtering then select a clear space on the graph, and once again the data in the table will be based on the whole time that is shown in the graphic.