Have you ever selected a Bookmark only to find the Bookmark Pane/Tree has disappeared?
There is a setting for the Bookmark Pane/Tree that will 'Hide' the Bookmarks after you have selected one.
To deactivate this setting show the Bookmark pane (Window>Show/Hide Bookmarks), and then click the Bookmark popup menu (black triangle at the top of the Bookmark scrollbar that points to the right) and select the 'Hide After Use' option (it should now have no tick next to the option).
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.