fullpage。js scrollOverflow不起作用，我根本无法从这个部分滑下来

The scrollOverflow attribute does not work properly in my project,there is no scrollbar when the content is overflowed, so I write a easy sample to figure out the problem. The problem is that When I check this on my Browser,No matter click or scroll,it doesn't work,I can only see the first section. Here is my codeThe scrollOverflow attribute does not work prop