If you're not ready to publish a campaign, you can save a campaign in progress as a draft. On each step of Facebook campaign creation from the Ads Design step (2) onwards, you can save your Facebook campaign as a draft, so you can resume building it later without losing your work.
Hootsuite Ads does not automatically save a draft of your Facebook campaigns. You must click Save As Draft at the top of the page during the campaign creation process.
Conversely, Google Ads campaigns are saved as drafts automatically, and can be found, resumed, and deleted, in the Google Ads Campaigns list.
To resume a draft
Find your saved draft campaigns in the campaign drop-down list, or click See all campaigns and then filter for Saved as draft in your campaigns list.