How do I add a new "job experience" or "education" box to the formatted CV?

Step 1: Towards the top of the CV-editor page, you will see the new 'Transform' menu.

Step 2: Open the menu and select Add data or Clear data, depending on what you'd like to do. Then, select whether you'd like to add a new experience, education or free text box. Similarly, if you're clearing data, choose whether to clear education data, experience data or all data from the document.