The issue was the Gutenberg issue. Gutenberg not showing the “Page Layout” option. However, you must have to select the “Page Layout” as “Fullwidth”http://prntscr.com/ltcyco to show the custom sections in the page.
In this issue, you need to use the classic editor and we have installed the classic editor plugin for you. Now everything working well.
Moreover, we are working on the update of the theme to make compatible with the Gutenberg.