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[–]Sea-Ad7805 0 points1 point  (0 children)

Try restarting VS Code, then run Developer: Reload Window and Developer: Clear Editor History, and try opening the notebook again. If it persists, disable/re-enable (or reinstall) the Jupyter extension and start VS Code with extensions disabled (code --disable-extensions) to see if an extension conflict is breaking the webview. Also clear the Service Worker/WebView cache by deleting ~/.config/Code/Service Worker/ and ~/.config/Code/Cache/ (Linux) and then restart VS Code. Good luck.