After you have packed a folder, you can open it to make changes.
There are several ways to distinguish whether you are inside a folder, or viewing the entire project in the Tracks area:
In the Tracks area (outside the folder), the folder itself is visible on a track, the Logic Pro main window title bar shows the project name, and the Display Level button 
is dimmed.
When inside a folder, the folder track can’t be seen, the main window title bar shows the project name followed by the folder name (for example; Untitled: Chorus Folder), and the Display Level button is available.
Do one of the following:
Double-click the folder.
Select the folder you want to open, then use the Go Into Folder or Region key command.
If a MIDI region, rather than a folder, is selected when you use the key command, the Piano Roll Editor opens.
Double-clicking the header of a folder track opens the Mixer.
Do one of the following:
Double-click the background of the Tracks area (or use the Go Out of Folder or Region key command).
Click the Display Level button in the Tracks area menu bar. The help tag shows Leave Folder.
You move up one display level, and the contents of the Tracks area (showing the closed folder) are visible.