Please follow the below steps to reverse Journal Entries:
Step 2: Click on "Old Journal Entries".
Step 3: Select the date range and click on the "Fetch Report" button if you are not able to see the Journal Entry on-screen which needs to reverse.
Step 4: Decide which entry needs to reverse.
Step 5: Click on the "Delete" button of the respective journal entry row.
Step 7: Journal Entry has been voided.