The campaigns are set to expand with the amount of content that you add to your newsletter. You can add in blocks, like you mentioned and then stat adding text/images to expand the whole newsletter further. When adding in blocks, in order to make sure they go where you want them to (like the end of your campaign) you can click and drag them into your newsletter or you can copy an existing block. Here are some steps on how to manage the blocks within your campaign.
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