Jupyter notebookのUIが変更になっていました
the new interface was launched with Notebook version 7.0.0 (which you are pprobably on). This new interface is known as RetroLab and comes with an updated appearance similar to JupyterLab. 引用: https://stackoverflow.com/questions/71363525/jupyter-notebook-interface-different
JupyterLab provides an advanced computational environment that can be compared to traditional IDEs and text editors like VS Code and PyCharm. However in some cases, having a leaner, simpler, and more focused interface to work on a notebook is really useful. Technically speaking RetroLab remixes many of the existing plugins for JupyterLab (notebook, toolbar, terminals) and reassembles them in a different way. It also supports prebuilt third-party extensions using the new distribution system added in JupyterLab 3.0. That way, many extensions built for JupyterLab will also be compatible with RetroLab. 引用: https://blog.jupyter.org/retrolab-a-jupyterlab-distribution-with-a-retro-look-and-feel-8096b8b223d0
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