I made an ahk script that (watches) for the taskbar and that little white-line indicator, and then makes them not there. I did it for a couple of reasons. I want the screen clean, but I don’t want to be the one doing it, so this:

SendMode Input
SetWorkingDir %A_ScriptDir%
#SingleInstance force
SetNumLockState, AlwaysOn
Process, Priority, , High

Loop {
WinWait, ahk_class Shell_TrayWnd
WinHide ahk_class Shell_TrayWnd

I have another script that uses WinH to toggle the taskbar line’s visibility, but that’s not quite so satisfying. I have yet another version that’s simply clickable, hides the line, then exits. Anyone wants to see those, just say so.