Have you triedSince you're using Org Mode, C-xc C-cx b (org-tree-to-indirect-buffer)? may be the best solution. It creates an indirect (new) buffer and narrows it to current subtree, leaving the rest of the document as is.
`C-x C-c` would close Emacs by default. Added extra text because edits must be at least 6 characters.
Conor
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