You won't be able to change the position of the text box by dragging it. Instead, you can choose the desired layout for any section by using the choices on the right.
When in the edit mode, click on the section where you want to change the position of the text box. On the right, you can click the "Layout" bar. A column of choices will come up to change where your text goes. If none of the choices are what you're looking for, you may try out different themes for the overall website. Some of the layout choices will vary, depending on the theme you've chosen for the site.
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