Before displaying items in an agenda view, Org mode visually prepares
the items and sorts them. Each item occupies a single line. The line
starts with a prefix that contains the category (see Categories)
of the item and other important information. You can customize in
which column tags are displayed through org-agenda-tags-column. You
can also customize the prefix using the option
org-agenda-prefix-format. This prefix is followed by a cleaned-up
version of the outline headline associated with the item.