The header section of each report screen contains filters that you can use to customise the report to your needs. Almost all reports can be filtered by organisation unit and cost centre. Most can be filtered by time period (month, quarter or year), and some can compare time periods (for example, year-on-year or date ranges):
If you change the filters in the header section, click Generate report to see the data with the new settings.
You can also switch to a different report by means of the Analysis Domain and Report fields.