这些.conf文件属于HOCON类型(人类优化的配置对象表示法").要启用折叠功能，您必须强制编辑器对它们进行同样的处理.在IntelliJ设置中，如下所示进行配置:

Those .conf files are of HOCON type ("Human-Optimized Config Object Notation"). To enable folding them, you have to force the editor treat them as such. In IntelliJ settings, configure it as illustrated:

Preferences->Editor->File Types，然后在HOCON文件类型中添加文件名模式.

Preferences->Editor->File Types, and there add filename patterns to HOCON filetype.