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I have spent a lot of time looking for this information on the Internet。Unfortunately,I can not find it。Please help me。Thank you,Thank you。 (I do not how to describe this question。May god forgive me for my poor English。)

我心永恒
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If you are looking for the ability to click ">" to open and close cells, for the current Notebook, you can set this in the preferences. You can open the Preferences, Click the Advanced Tab and Click the "Open Option Inspector" Button. Select Open Option Inspector

Select from the dropdown menu Selected Notebook, and change the Option for Cell Options, Display Options, Show Group Opener to for example "Outside Frame":

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This should give you in this example the ability to open and close cells with clicking ">": enter image description here

GIM
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