I have installed Xfce on my PC. Everything works but a couple of transparent lines appear over all windows, as shown in the screenshot at below.
How I can remove the lines?
Uncheck Settings Manager > Window Manager Tweaks > Compositor > Show shadows under dock windows.
Open Settings Manager by -> Applications -> Settings ->> Settings Manager.
In Settings Manager window, open Window Manager Tweaks.
In Window Manager Tweaks, go to 'Compositor' tab.
Under the tab, disable shadow options.