How to display comparative year?

Open the financial report and then click the gear wheel (yellow highlight)

The "Financial Options" will show in the left side. Click "Comparison Periods" and select the year(s) applicable you want to show as comparative.

Multiple Comparative Period 

The "Comparison Period" is different for "Basic Financial" (Free version) and the "Financial Report Plus" (paid version)

Why Comparative Years not available

The comparative figures are not coming into the reports.

Solution, Please re-import the financials.