How to correct indentation in IntelliJ

Just select the code and

• on Windows do Ctrl + Alt + L

• on Linux do Ctrl + Windows Key + Alt + L

• on Mac do CMD + Option + L

Code → Reformat Code... (default Ctrl + Alt + L) for the whole file or Code → Auto-Indent Lines (default Ctrl + Alt + I) for the current line or selection.

You can customise the settings for how code is auto-formatted under File → Settings → Editor → Code Style.

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To ensure comments are also indented to the same level as the code, you can simply do as follows:

_{(example for JavaScript)}