Firstly, don't panic! Safari Portal makes it really simple to re-add a section block that you may have deleted accidentally.
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First, hover underneath any element on the right side of the page. This will display the blue 'Add New Element' line.
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Next, click on the blue line to add a new element.
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From the 'Add New Element' library, select the 'Section' element.
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There you have it, the section block has been added back to your page!