The summary part is displayed at the bottom of the invoice or estimate. You can turn off and on the different elements by visiting the PDF and Print Settings. 

• Total Quantity 
• Amount Unused 
• Sub Total 
• Discount 
• Inline Discount 
• Shipping Cost 
• Shipping Method
• Total 
• Amount Due 
• Amount Paid 
• Amount Used 
• Tax (Individual, Hide, or Combine) 
• Tax % Value

While you turn on and off the various summary elements, you can preview the same. In the end, click on ‘Save’ to apply the changes.