Yes! You can certainly put a campaign in draft mode.
Once you've started creating a campaign and past the first page of that process, you'll have the option to click 'Save & Go Back'. You can then navigate away from this page and find the campaign in draft by navigating to 'Campaigns' on the top lefthand side.
If you accidentally submitted a campaign and it’s now pending, you may be able to put it back into draft if it has not yet been approved by our team. Please kindly reach out to your account manager or contact us through the chat function with this request and we can assist you from there.