You may find that you need to extend the consultation period on a Citizen Space consultation that is already published, or even to re-open a consultation that has closed.
This is straightforward to do and you don't need to retract the consultation to make this change.
From the Consultation Dashboard, go into 1. Edit Consultation Details. Move the closing date to your new chosen date & select "Save changes" at the bottom of the page.
It may also be a good idea to add some additional text to the consultation overview page clarifying that the closing date has moved forward & explaining the reasons why.