Program Options - Settings - Window Options - Show on TaskBar when active = disabled (not checked)
Program Options - Settings - Advanced Visuals - Do not show icon in system tray when minimized = enabled (checked)
This is my current configuration.
I have no task bar entry (never) but the tray notification icon appears every time I invoke FARR and stays there as long FARR is active (waiting for a search input). If I hit Esc, or close the gui with the little x, the tray notification icon vanishes.
I'm on Windows 7 Ultimate, x64, german language.