a horizontal split line presenting when log into desktop

[bxbzq]

HI, please see the screenshot. Close to the bottom of the screen, there is this line.

Desktop XFCE. Graphic card NVIDIA 4070.

% freebsd-version -kru
14.2-RELEASE
14.2-RELEASE
14.2-RELEASE

How do I get rid of the weird line?

 

[HayPhil]

It is the background of cairo-dock.

 

[bxbzq]

It is the background of cairo-dock.

I have no cairo-dock installed, but plank.
The question is, how do I get rid of it. It wasn't there before a "pkg upgrade".

 

[VladiBG]

Turn off "Show shadows under dock windows"

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