Click on the up and down arrows to the right of the gold tab at the top of each set of comments to move between comments. Usually this will take you to the next or previous comment reading from the top of the file. But you can change the order using on the menu.

You can use CTRL+DOWN-ARROW on the keyboard to go to the next comment, and CTRL+UP-ARROW to jump to the previous one.

You can also jump directly to a comment by clicking on the red proofmark for the comment overlaying the page view (often an asterisk or square brackets ).

If you have scrolled away from the comment you can get back to it by clicking on the right arrow to scroll the page to bring the comment you are looking at into view.

If you have scrolled away from the comment you can get back to it by clicking on the yellow banner at the top of the comment or the right arrow .

Even if you can already see that part of the page, the flashing yellow arrow will move to the comment in question so you can identify it.

You can do all of these, or go to the first comment in the document, using the entries on the menu: