When opening PDF Reader, you will see the 4 functions in the toolbar on the left-hand side, which are Thumbnails, Annotations, Bookmarks, and Outlines, as shown in the picture below.
By clicking , you can see all the pages of this document in a list of thumbnails in this section, so you can easily jump between pages while you are reading the document.
By clicking , you can find all the annotations (Note, Highlight, Underline, Strikethrough..., etc.) and comments you made throughout the document, so it’s easier to jump between them when you want to quickly review the document.
When using the annotation tools, you will see the properties panel on the right side of the screen. You can also click to pin the panel to stay on the window.
All the bookmarks you have marked in this document will be shown in the bookmark tab.
To add a new bookmark, tap the bookmark icon on lefthand toolbar and then click for adding the page you would like to bookmark. A dialogue will appear for you to name this bookmark, and the suggested name of the bookmark will be "Page #."
To rename a bookmark, just right-click on the page you have bookmarked and type in a new name.
To sort bookmarks, tab on . You can sort by Date, Name, or Page the bookmarks were established.
If the document you are viewing has a set outline, it will be shown here just by clicking .
If the document does not include a set outline, this panel will appear blank.