In the Apps menu, click Data Visualizer.
Select a chart type.
In the menu to the left, select the metadata you want to analyse. You must select one or more elements from all of the three dimensions - data (indicators, data elements, reporting rates), periods (relative, fixed) and organisation units (units or groups).
If you've access to the system settings, you can change the default period type under General settings > Default relative period for analysis.
Last 12 Months from the period dimension and the root organisation unit are selected by default.
Click Layout and arrange the dimensions.
You can keep the default selection if you want.