To view previous year data, you can change the time period or financial period.
On the dashboards homepage, go to the specific page where you want to view data (Employee data management/ Performance/ Development/ Talent management).
Go to the Data filter section and change the time period or financial year from the dropdown. Once you select a time period/financial period, it will be applicable across the application till you reset it.
The data for the selected time period will show up.