Rafal
Go to Start and type cmd. Right click cmd.exe in Programs and select Run
As Administrator.
At the top left of the command prompt screen, click the small black and
white icon. Select Properties / Layout Tab.
In the Windows Size box adjust the size you wish to use. When you adjust
these settings, you will see the result in the small black window at the
left of the dialog box. Adjust the values until it fills the screen. In the
Window Position, remove the check mark from the "Let system position window"
and adjust the values there to postion the screen at the center of the
window. Click OK.
Close and restart cmd.exe. If it is still not filling the entire screen go
back and readjust the settings until you get it the way you wish.