Toggle the visibility of the Bookmarks Bar by going to Settings > Bookmarks > Show Bookmarks Bar
How to change the position of the Bookmarks Bar
The position of the Bookmarks Bar can be changed in Settings > Bookmarks > Bookmark Bar Position.
How to add new Bookmark
Click on the Bookmark icon at the end of the Address Bar to save the current page as a new Bookmark. You can also use a keyboard shortcut Ctrl D / ⌘ D or just drag the link (starting from the padlock/globe icon) to the destination folder in the Bookmarks panel.