The setting instructs UltraEdit to show the page break character (as defined in Page Setup) as a line drawn across the screen. This will not modify the line numbering of the file. The line numbers are based on the line terminators only.
If this setting is checked, UltraEdit will draw a straight line horizontally across the screen immediately below the current line. Any text following the page break character will start on the line following the page break line.
If this setting is not checked, the page break character will be printed as with any other character and text will be displayed immediately prior to, and following the character according to what is present.