IDEA 在 专注模式下 显示 行号 和 缩进线...

 

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+50

Open the settings and navigate to Editor > General > Appearance and tick "Show hard wrap guide (configured in Code Style Options)".

Alternatively bring up the Find Action search with Ctrl+Shift+A (by default), search for "Show right margin" and hit enter to toggle the setting.

The trick is to change it with distraction free mode enabled.

EDIT: In versions of IntellJ before 2017.3, the menu option was called "Show right margin".