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Good morning people.
Sorry for English

How do I do in FCPX 10.3.4 to close in the brownser several groups together?
In previous versions of X, holding the "Shift" key, it was possible to close the Projects, Cameras, Audio groups. All the groups closed together.

This is no longer possible in 10.3.4. I can only close one at a time.

The function of opening and closing all sub-layer "disclosure triangles" within a group all at once uses the Option key, not the Shift key. This is an OS function, not exclusive to FCPX. Works in Motion and may other applications, including the Finder. "Option" keys, was never the Shift key.

Ok FCPX.guru, it really is the "Option" key, you're right.

But to open and close all the "triangles of disclosure" sub-layer within a group, all at once only works on "filmstrip". I can not close all using "list modes".

I thought it was a bug in the version as it does not work with "list mode"

I did this in the old versions using "Option" and had no problems with list mode.

Hackintosh Sierra 10.12.6
FCPX 10.3.4

Works for me in List mode just fine using FCPX 10.3.4 / macOS 10.12.6. But then I'm not using a Hackintosh, so I can't speak to that directly.