Enable price plan
To access invoicing and quotes feature, you will need to subscribe to Business price plan. Follow the below steps to subscribe to the Business price plan.
Plans and Billing
In the top right corner menu, click on Plans and Billing option.
Next, click on Add Payment Details to add your payment method. You can skip this step as payment details are not required during the free trial.
Click on Enable button to subscribe to the Business plan.
You should see invoicing option appear in the side menu, along with other features that come with the Business plan.