You can always switch between your recipient groups in a campaign. You often want to send your campaign to a test list before sending it to your contacts.
In order to change the recipient group in your campaign, you should go in and edit the campaign, “Edit campaign”. Next to the save and send button, you will find the button “Edit recipients”. From here, you can choose to send to one or more contact lists or to one of your segments.
Change recipient group on your campaign
Watch the video here about where to find “Edit recipients” in the builder