This can be achieved by ticking the box "Include subfolders" on the left-hand pane. This will list all files from all folders beneath the current folder. So when you do this in the project root, you can open all files from all subfolders.
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This can be achieved by ticking the box "Include subfolders" on the left-hand pane. This will list all files from all folders beneath the current folder. So when you do this in the project root, you can open all files from all subfolders.