ne's manual

4.9.4: FastGUI

true, ne tries to print as few as possible while displaying menus and the status bar. In particular, menu items are highlighted by the cursor only, and the status bar is not highlighted (which allows to print it with less characters). This option is very useful if you are using ne through a slow connection.

If you call this command with no arguments, it will toggle the flag. If you specify 0 or 1, the flag will be set to false or true, respectively.