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I’m not able to format my code in IntelliJ.
I can see the margin line (by default at 120 columns) but it seems that the activation from the menu:
Code -> Reformat Code
is just ignoring this margin.
Do you mean that the formatter does not break long lines?
Then please check:
Update:
In later versions of IntelliJ, the option can be found under:
There select
Wrap when typing reaches right margin.