[zzo38computer]

I think that the software should fill the window, not the entire screen unless the user has used the full screen mode or if it is not on the window system (e.g. for full screen DOS software).

If it is a window system but the software may use a fixed screen size, then whether it is window or full screen depend what resolution is set, and may have a user option to set integer zoom. However, this is usually for a computer game, and if you can, it is best to allow the user specified size.

I don't like the websites to don't use the full width of the screen for text; the user can resize the window to put the width that they want instead. If a website does not use the full width, I will use the Stylish extension to override it.

However, many program doesn't need GUI, it can be command-line interface, and does not need to deal with screen space at all (and you can use for example "| less" if it doesn't fit on the screen and want to scroll through it).

I also think that a maximum password length of four digits is way too short, although maybe that can be reasonable as the minimum length.