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How can I start over if I’ve messed up my IntelliJ setup?

See the how-to video ‘Start over your IntelliJ setup’.

How can I turn on distraction-free mode in IntelliJ?

See this Stack overflow article.

Why do I get an error message Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachi...?

This is a known bug in the current version of IntelliJ. For now you can safely ignore it.

Updated:    12 Jan 2021 / Responsible Officer:    Head of School / Page Contact:    Steve Blackburn