@OSEPDIt is unlikely. Some features will respond to the Undo button at the top of your screen, but most do not. The templates "save" after each edit so it does not revert back. To my knowledge, your best bet would be to go to your live site and copy the text out of the section you deleted. Then recreate that section. Otherwise, you may want to call customer service to see if there are any other options they can offer. Good luck.
@HopefulThere's a selection for which backup to restore, but they'll need to weigh if that may be easier or copy&pasting from the live site.
@OSEPD @Hopeful The Site History feature that @Nate mentioned automatically backs up a GoCentral site any time there is a change. This would include section deletion. Conceivably, you should be able to restore from the version that had the section if it was recent.