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There seems to be a command to display only the text in the selected region, leaving the rest of the text hidden. What is the command?

  • Are you perhaps referring to narrow and widen? – Dan Sep 3 '17 at 11:43
  • Yes! Thank you so much for telling me this. – dragon Sep 3 '17 at 11:45
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As @Dan commented, you are referring to "narrowing" the buffer. For details read the Narrowing section in the Emacs Manual.

The command narrow-to-region (bound to C-x n n by default) will do what you want. Use widen (C-x n w) to remove the restriction and see the whole buffer again.

In some modes there may be other ways to narrow things. For example, use narrow-to-defun to focus on the current function in many programming modes; and in org mode you can use org-narrow-to-subtree.

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