How to remove the gray line in JDeveloper?

Hello,
I'm working with JDev now.Now I'm facing a problem, when I want to format my codes in JDev I find many lines of code changed to double. I also notice that the point for newline is the gray line in the coding area.
Now I want to remove the gray line or move it more right so I can format my codes really more beautiful.
If there is anybody knows the way,please show me how to deal it.Thank you.

Sorry,your answer has not figure my issue. The link you gave me does not contain my question.Thank you for your answer.

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