What is the gray hilight in SQL Worksheet?

I write various SQL Statements on the worksheet, hilight the portion I want to execute and either run it by hitting F5 ot F9.
After execution, SQL Developer hilight a portion of text in gray. What is the criteria to hilight something in gray? So far I don't see any logic, sometimes, the gray hilight disappears, sometime it hilight half of a SQL statement, sometimes the hilight is placed on a section of code which has nothing to do with the real section being executed.
I have trouble understanding the idea behind this gray hilight and I would like to turn it off. Can you please show me how to do this?
Thanks in advance.

This is the 'Current SQL' highlight and it should cover the statement you just executed (with f9). With f5 it moves within the script as the execution point moves.
It always misses out the last line, but I've never seen it covering random parts of a statement.
I don't think you can get rid of it entirely, but you can make it more transparent by setting its background to white (or whatever your worksheet background is, and the foreground to transparent.
Go to Tools | Preferences | Code Editor | Syntax Colors and select Current Sql in the Available Styles box and experiment with the colours.

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What is the gray hilight in SQL Worksheet?

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