https://blog.wongcw.com/2019/02/07/libreoffice-6-2%e6%ad%a3%e5%bc%8f%e7%99%bc%e5%b8%83%e5%b8%b6%e4%be%86%e6%96%b0%e7%9a%84notebookbar-ui%e5%92%8c%e6%9b%b4%e5%a4%9a%e6%94%b9%e9%80%b2/