Ctrl-Shift-O and blue outline arrows on the left side and black palette.

I like to use the black palette under Preferences > LPEX Editor >
Appearance.

Unfortunately the blue outline arrows become almost invisible (to me)
since using the black palette causes
the background area for the blue outline arrows is too dark.

Is there a way to set either the outline lines or their background area to
something more visible?
(I honestly haven't looked hard for this yet but the recent 'procedure am
i in thread' got me digging around) L:-)

John
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