"HIDE EXCLUDE"

When you are editing a dataset in ISPF, you can exclude lines by typing 'x' in the line number area. When you do that, you see the excluded lines as a row of dots. You now have the option of entering 'HIDE EXCLUDE' on the command line. The line of dots disappears and is replaced with a solid line in the number area.

RESET will behave as before; RESET HIDE will return the row of dots to your display.