Folding arrows no longer appear in jupyterlab-toc

a problem occured

When using jupyterlab-toc as usual, the folding arrow disappeared image.png I can't open the code that was already folded and it's stuck, so I'll leave a workaround.

approach

Open Advanced Setting Editor image.png

The solution is to change the Table of Contents setting to true and update. image.png

I did it image.png

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