Projects files appear and disappears (macOS)
Answered
Hello, I just downloaded intellij on this computer and it won't allow me to see my project tree. Sometimes it show up and about seconds later file closes and tree disappears. 
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Please allow the IntelliJ IDEA process to access the restricted folders on macOS or move your project outside these folders (Downloads, Desktop, Documents).
See https://youtrack.jetbrains.com/issue/IJPL-2152/IDEA-should-notify-users-on-macOS-if-there-is-no-access-to-the-directory-of-the-project-and-require-access .