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enter image description here

Pretty much you can see that this line won't show visual change. When i try to change the stroke it shows only in the navigator bar but o

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You are looking at the "View Outline". You must have pressed the shortcut by accident.

To view all artwork as outlines, choose View > Outline or press Ctrl+Y (Windows) or +Y (macOS). Choose View > Preview to return to previewing artwork in color.

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