Blue vertical line in gutter
What is this blue vertical line and how do I disable it? It appears in the gutter to the right of the line numbers. "Show Gutter Icons" is unchecked.

It seems to show the range of a piece of code, like a function or similar. Thanks for any help.
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Hi there,
I do not see any option to disable such functionality.
But you can hide it (make it the same colour as gutter area -- e.g. uncheck all styles): "Settings/Preferences | Editor | Colors & Fonts | General --> Code | Matched brace" -- note that it will also affect matching braces in editor area (actual symbols).