A variável org-agenda-skip-scheduled-if-deadline-is-shown
pode ser usada para ocultar todos os agendamentos da agenda se eles também tiverem um prazo e já estiverem sendo exibidos com o prazo.
Eu escolhi o valor Not when scheduled today
para que, pelo menos no dia em que o item é agendado, eu o veja duas vezes e, em seguida, possa excluir a data agendada.
Documentation:
Org Agenda Skip Scheduled If Deadline Is Shown
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 t, then only the deadline is shown and the fact that the entry is scheduled today or was scheduled previously is not shown. When this variable is nil, the entry will be shown several times. When the variable is the symbol 'not-today', then skip scheduled previously, but not scheduled today.