The Table of Contents (TOC) is displayed incorrectly --- 目录 （TOC） 显示不正确

[wanders78746]

In the hierarchical table-of-contents (TOC), the display of the main part (indicated by the right arrow) is inconsistent. If expanded, the main section (indicated by the down arrow) does not collapse back into a row.

在分层目录 （TOC） 中，主零件的显示（由右箭头指示）不一致。如果展开，则 main 部分（由向下箭头指示）不会折叠回一行。