What does Linux less -zn or –window=n or -n option do?

Less -zn or –window=n or -n option changes the default scrolling window size to n lines. The default is one screenful. The z and w commands can also be used to change the window size. The “z” may be omitted for compatibility with some versions of more. If the number n is negative, it indicates n lines less than the current screen size. For example, if the screen is 24 lines, -z-4 sets the scrolling window to 20 lines. If the screen is resized to 40 lines, the scrolling window automatically changes to 36 lines.

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