If you have included a deadline in one of your listings, the listing will still expire 30 days after it's published, regardless of what the deadline states.
If the 30 days haven't passed yet, you can hide your listing at anytime. To do so, log in to your Idealist.org account and access your dashboard by clicking on your name at the top and clicking on your organization’s name in the dropdown menu. Once you’ve accessed your dashboard, scroll down to the listing you would like to hide. The status should currently say “Published” with a green dot next to it, so you know it is active right now.
To the right of the status, click on Hide:
Please note: When your listing is hidden, the listing will still expire after the 30 days have passed. However, you can unhide it at any time before the 30 days have passed.