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In the menu bar, look for the 'View' -> 'Active Editor' -> 'Use Soft Wraps' option. However, this will only work for the file that is open.
If you want to keep this option in the editor in general (for all files), then you have to configure in Preferences -> General -> In the tab, you disable 'Use Soft Wraps in Editor'.
It’s called wrap. This question may help you: https://stackoverflow.com/q/10351608/1452488.
– Woss