Transparent bar at the bottom after installing Plank

After installing Plank, this transparent panel appeared and cannot find any way to remove it. Any ideas? I am using Manjaro XFCE, latest edition. Only the border shadow is visible, rest of the panel is invisible. It’s visible over all the screens.

This should help

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Thanks for the reference. The setting to search for is Window Manager Tweak. I was going through Window Manager only.