Document controls: Shows options for setting page orientation, page size, and margins; and adding headers, footers, bookmarks, and document sections. It appears on the right side of the Pages window.
Page thumbnails: Shows thumbnails of all the pages in your document. In this view, you can rearrange document sections and navigate to a particular page by clicking its thumbnail. It appears on the left side of the Pages window.
Table of contents: Shows an automatically updating table of contents that you can use to navigate your document. Entries are generated from text that you’ve applied paragraph styles to, and you can choose the paragraph styles you want to display in the table of contents. It appears on the left side of the Pages window.
Comments & Changes: Refers to as a pane, shows the comments you and others added to the document. You can read, add, and edit comments directly in the pane. It appears on the left side of the Pages window.
Go to the Pages app toolbar to open the sidebar and show the controls. To close the sidebar, click the button of the active sidebar to close it. For example, if the formatting controls are visible, click Format Add and print comments in Pages on MacSet paper size and orientation in Pages on Mac