WinFocus Roman Hrusha
Use this command to install WinFocus with WinGet:
winget install --id=rhrusha.WinFocus -e WinFocus draws a thin colored border around the monitor that holds the focused window, and a second border around the focused window itself (hidden while that window is maximized or fullscreen), so you always know where your typing will go on a multi-monitor desktop. Native Win32, single exe, no tray icon, no service. Run "winfocus --install" once to start it at logon; "winfocus --uninstall" removes it.