disable can disable either a breakpoint or a display, depending on what type you provide. However, there are two separate commands for removing a breakpoint (delete) and removing a display (undisplay). There have been a few times that I have tried the command "delete display 1", forgetting about "undisplay". I'm not saying it needs to be changed, as "undisplay" seems like a more accurate command than "delete display", but I figure if I'm being repeatedly tripped up by it then others will be too.