Hello @jerryw,
Thank you for reaching out to the Community! When dragging and dropping content over from the left-hand side, your mouse tells you where it is going to drop by turning into a purple line. If your mouse is a vertical purple line on the side, you know it's going to drop in its own column and drop on the side. You want your mouse to be horizontal on your email, and that means it will stay only one column and drop below or above everything else. See the picture below for more help!
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