He opened his attaché case, removed a folder, then closed it again.

他打开了他的公文包，拿出了一个文件夹，然后又把它合上了。

《柯林斯英汉双解大词典》

If you open a different folder, the currently open folder is closed automatically.

如果您选择另一个文件夹，则当前打开的文件夹将自动关闭。

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Recommendation: With the SDP closed, remove the .metadata folder in the workspace directory, reopen the SDP, and import the project folders from the file system.

推荐：关闭 SDP，将 .metadata 文件夹从工作区目录中删除，重新打开 SDP，从文件系统中导入项目文件夹。

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