I would like to hide (make it of the same color as others) or completely turn off that line, to make a perfect transition from Folder Tab to Location Bar. Is there a way do it or can it be implemented?
No way to do that currently.
You can make the colors match to make it look like there is no line.
I think it's all these settings:
Settings / Colors and Fonts / Directory Opus Colors / Folder Tabs / Selected Background
Settings / Colors and Fonts / Directory Opus Colors / Location Bar / Active Background
Settings / Colors and Fonts / Directory Opus Colors / Location Bar / Inactive Background
Settings / Colors and Fonts / Directory Opus Colors / Pane Borders / Highlight
Settings / Colors and Fonts / Directory Opus Colors / Pane Borders / Shadow
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Thanks! Pane Borders color change is indeed what was needed:
(also cool look of your Lister!)
But of course changing it there also changes Pane Borders colors elsewhere, so that's not a desired solution, unfortunately. Will wait for a separate setting, maybe 
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