Method 1: To add a bookmark, turn to the desired page and right-click to Add Bookmark.

Directly Add Bookmark
Method 2: Click on the Add Bookmark button in the bookmark panel to add a bookmark to the current view.

Add and Rename the Bookmark
The bookmark needs to be named when it is created. It can be renamed by right-clicking on it and selecting Rename Bookmark.
Right-click on the bookmark and click on Add Sub-bookmark to add a sub-bookmark.
To delete a bookmark, simply right-click on the bookmark and click on Delete Bookmark.
Or click on the Delete Bookmark button in the bookmark panel to delete a bookmark.

Delete Bookmarks
Click on Expand or Collapse in the bookmark panel to expand or collapse the sub-bookmark.

Expand or Collapse Bookmarks