wCenterWindow

This program centers the current active window by a LCTRL + LWIN + C hotkey, or pressing LCTRL + LWIN + MMB (Middle Mouse Button).

LCTRL + LWIN + V - manual editing of size and position of the window.

You can use LCTRL + LWIN + I hotkey for hide/show trayicon. You can also use commandline option /hide for hide trayicon at startup.

Use workarea option means that the window is centered without a taskbar, otherwise, the full resolution of the monitor will be used.

If some windows does not centers you should run wCenterWindow with administrative rights.

Automatic startup

Usually, to start the application when Windows starts, it is enough to put the application's shortcut in the "Startup" folder -
"C:\Users[Your user name]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup". (The easiest way to get there - press 'WIN + R' and type 'shell:startup').
However, in this case wCenterWindow will not be able to work with windows that are open with elevated privileges. And if you enable the "Run as administrator" option in the shortcut, then wCenterWindow will not start. This is related to the security of Windows (maybe only in 10/11, I did not check).
This behavior can be bypassed by creating a task in the Task Scheduler with the "Run with highest privileges" option.
Note: If you run wCenterWindow via the Task Scheduler, I highly recommend enabling the "Delay task for" option for 15-30 seconds, otherwise you may get an error message "Can't create tray icon".