Collapse and Expand
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¬  Collapse: Pressing the Collapse button (Command  !) in the Edit  menu collapses the subtree rooted at the selected node.

Tree before collapsing:
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Tree after collapsing:

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The Collapse button in the Edit  menu changes its title to Expand.

¬  Expand: Pressing again the button (Command  !) expands the collapsed node.

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See also

;WhatAttachments.rtfd;;¬	Select Node