jupyter notebookの機能拡張をnbextensions configページで管理したい

Question

###前提・実現したいこと

• Anaconda経由でjupyter notebookを使用しています。
• 機能拡張自体も現在使用できています。
• しかし、機能拡張を管理する

http://localhost:8888/nbextensions/

にアクセスしても**なぜかページは空白（何もない状態）**です。

• ターミナルで

jupyter nbextension enable codefolding/main

など個別のON/OFFは可能です。

• ですが、まとめて管理するページがないと不便に感じます。
• どなたかアドバイスをよろしくお願いします。

###発生している問題・エラーメッセージ

• 特にエラーメッセージは出ていません。

以下、http://localhost:8888/nbextensions/を開いた際のターミナルを見ると、機能拡張の読み込み自体には特に問題はなさそうです。

[I 16:50:58.456 NotebookApp] Found 4.x extension SKILL Syntax
[I 16:50:58.459 NotebookApp] Found 4.x extension NbExtensions menu item
[I 16:50:58.469 NotebookApp] Found 3.x, 4.x extension Gist-it
[I 16:50:58.478 NotebookApp] Found 4.x extension Printview
[I 16:50:58.483 NotebookApp] Found 4.x extension table_beautifier
[I 16:50:58.493 NotebookApp] Found 4.x extension zenmode
[I 16:50:58.510 NotebookApp] Found 3.x, 4.x extension AutoSaveTime
[I 16:50:58.553 NotebookApp] Found 3.x, 4.x extension Autoscroll
[I 16:50:58.558 NotebookApp] Found 4.x extension Chrome Clipboard
[I 16:50:58.566 NotebookApp] Found 4.x extension Code Font Size
[I 16:50:58.570 NotebookApp] Found 4.x extension Codefolding
[I 16:50:58.597 NotebookApp] Found 4.x extension Collapsible Headings
[I 16:50:58.603 NotebookApp] Found 3.x, 4.x extension Comment/Uncomment Hotkey
[I 16:50:58.607 NotebookApp] Found 4.x extension datestamper
[I 16:50:58.610 NotebookApp] Found 4.x extension Drag and Drop
[I 16:50:58.615 NotebookApp] Found 4.x extension Equation Auto Numbering
[I 16:50:58.617 NotebookApp] Found 4.x extension ExecuteTime
[I 16:50:58.619 NotebookApp] Found 4.x extension Exercise
[I 16:50:58.622 NotebookApp] Found 4.x extension Exercise2
[I 16:50:58.624 NotebookApp] Found 4.x extension Freeze
[I 16:50:58.627 NotebookApp] Found 3.x, 4.x extension Help panel
[I 16:50:58.632 NotebookApp] Found 3.x 4.x extension Hide input
[I 16:50:58.634 NotebookApp] Found 3.x 4.x extension Hide input all
[I 16:50:58.636 NotebookApp] Found 3.x, Jupyter (4.x) extension highlighter
[I 16:50:58.638 NotebookApp] Found 4.x extension Hinterland
[I 16:50:58.645 NotebookApp] Found 3.x, 4.x extension Initialization cells
[I 16:50:58.653 NotebookApp] Found 4.x extension Keyboard shortcut editor
[I 16:50:58.666 NotebookApp] Found 3.x, Jupyter (4.x) extension (some) LaTeX environments for Jupyter
[I 16:50:58.683 NotebookApp] Found 4.x extension Limit Output
[I 16:50:58.689 NotebookApp] Found 4.x extension Move selected cells
[I 16:50:58.697 NotebookApp] Found 4.x extension Navigation-Hotkeys
[I 16:50:58.723 NotebookApp] Found 4.x extension Notify
[I 16:50:58.726 NotebookApp] Found 4.x extension Python Markdown
[I 16:50:58.728 NotebookApp] Found 4.x extension Launch QTConsole
[I 16:50:58.732 NotebookApp] Found 4.x extension Rubberband
[I 16:50:58.745 NotebookApp] Found 4.x extension Ruler
[I 16:50:58.748 NotebookApp] Found 4.x extension Runtools
[I 16:50:58.751 NotebookApp] Found 4.x extension Scratchpad
[I 16:50:58.753 NotebookApp] Found 4.x extension Search-Replace
[I 16:50:58.755 NotebookApp] Found 4.x extension Skip-Traceback
[I 16:50:58.762 NotebookApp] Found 4.x extension spellchecker
[I 16:50:58.764 NotebookApp] Found Jupyter (4.x) extension Split Cells Notebook
[I 16:50:58.776 NotebookApp] Found 4.x extension Table of Contents (2)
[I 16:50:58.784 NotebookApp] Found 3.x 4.x extension Toggle all line numbers
[I 16:50:58.788 NotebookApp] Found 4.x extension Tree Filter

###該当のソースコード

###試したこと

・ブラウザ（chrome）のキャッシュを消去したが変化なし
・conda install -c conda-forge jupyter_contrib_nbextensions など再インストールしても変化なし

###補足情報(言語/FW/ツール等のバージョンなど)
jupyterのバージョン：4.2.1

Answer 1

参考：AnacondaのJupyter notebookでnbextensionsを使うを参考にしてnbexternsionsの入っていない素のanaconda環境から以下にてインストールしました。

conda install -y -c conda-forge jupyter_nbextensions_configurator jupyter_contrib_nbextensions

その後HomeにNbextensionsタブが表示され一覧が表示されました。
違いはjupyter_nbextensions_configuratorの有無でしょうか。
参考まで。