org-agenda-skip-scheduled-if-deadline-is-shown

org-agenda-skip-scheduled-if-deadline-is-shown is a variable defined in `org-agenda.el'.
Its value is

nil

Documentation:
Non-nil means skip scheduling line if same entry shows because of deadline.

In the agenda of today, an entry can show up multiple times
because it is both scheduled and has a nearby deadline, and maybe
a plain time stamp as well.

When this variable is nil, the entry will be shown several times.

When set to t, then only the deadline is shown and the fact that
the entry is scheduled today or was scheduled previously is not
shown.

When set to the symbol `not-today', skip scheduled previously,
but not scheduled today.

When set to the symbol `repeated-after-deadline', skip scheduled
items if they are repeated beyond the current deadline.

You can customize this variable.