Can't open ipynb as jupyter notebook file after updating 2023.3.1 version
Answered
and disappear the feature making new jupyter notebook file
So, I have downgraded old version. 2023.2.5. and there's no problem.
How can I solve this problem?
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This is a known issue: https://youtrack.jetbrains.com/issue/PY-64575/Jupyter-Notebook-support-doesnt-work-in-Python-plugin-in-IDEA-2023.3-release
Feel free to vote and watch the YouTrack item in order to be notified once it has updates. See this article if you are not familiar with YouTrack.
Workaround