How do I make a bookmark appear when I open the PDF?

  

How do I make a bookmark appear when I open the PDF? In other words, how to make PDF bookmarks always open?

When a friend makes a PDF file, a bookmark is created. After saving and then opening, you must click the bookmark to open the bookmark. But for some PDF files, the bookmark bar is always open. As soon as you open the PDF file, the bookmark bar is opened, and you can see the directory very intuitively. So how do you make a bookmark appear when the PDF is opened?
In fact, in Adobe acrobat, it is possible to set the bookmark of the PDF to be always open. (Adobe acrobat need not say it, friends who make PDF should be familiar with it, if you do not know Adobe acrobat, please Baidu.) 1, in Adobe acrobat, open your PDF file; 2, click on the menu "Files" - "--" properties", open "ld document properties" form; 3, continue to point "initial view" label, pay attention to the following "layout and magnification" Under the "Navigation tab", 4, if you want the bookmark to be initially open, please click on the "Bookmark panel and page" or "Page panel and page", other settings you see as appropriate And set. No need to change it. Then “OK”, save, exit. OK, then open it and see if the PDF bookmark is always open. I am Adobe Acrobat 8 ​​Professional, you can give it a try.

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