Fold all: Ctrl + Shift + PAGE UP
Unfold all: Ctrl + Shift + PAGE DOWN
Collapse the current level: Ctrl + PAGE UP
Uncollapse the current level: Ctrl + PAGE DOWN
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Fold all: Ctrl + Alt + LEFT ARROW
Unfold all: Ctrl + Alt + RIGHT ARROW
Collapse the current level: Alt + LEFT ARROW
Uncollapse the current level: Alt + RIGHT ARROW
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Recommend!
New Shortcut (Shortcut mapper):
Fold all: Ctrl + Shift + PAGE UP
Unfold all: Ctrl + Shift + PAGE DOWN
Collapse the current level: Ctrl + PAGE UP
Uncollapse the current level: Ctrl + PAGE DOWN
I prefer using this:
Fold all: Ctrl + Alt + LEFT ARROW
Unfold all: Ctrl + Alt + RIGHT ARROW
Collapse the current level: Alt + LEFT ARROW
Uncollapse the current level: Alt + RIGHT ARROW
I suggested "toggling" and to use Alt+0, Alt+1, ...
please see
https://sourceforge.net/forum/forum.php?thread_id=1539068&forum_id=331753