虽然以上答案都是正确的.我观察到上述选项在 IntelliJ 2020.2 版本上不可用.所以，你需要去设置 ->构建工具 ->检查更改构建脚本后重新加载项目" ->检查任何更改"

Although above answers are correct. I have observed that above option is not available on IntelliJ 2020.2 version. So, there you need to go Settings -> Build Tool -> Check "Reload projects after changes in the build scripts" -> check "Any changes"