We facing a issue in Website Builder UI that is if we try to add Insert Block just before the footer and for some reason we delete the snippet which have draged and dropped and then try to select another snippet from Insert Block, now its strange that we will only able to see the Content section other all sections are invisible.
We can get it back by simply discard the changes and try to Edit again the page, but thats not a solution. We feel its issue if anyone have any solution please inform us.
Otherwise Website Builder UI is a great feature.