mc-read-mode and mc-write-mode will each indicate they are
active by placing the string `MC-r' or `MC-w' in the mode
line, respectively.
You can change these strings by setting the variables
mc-read-mode-string and mc-write-mode-string. So, for
example, to get rid of the mode indicators entirely, you might put the
following lines into your `.emacs' file:
(setq mc-read-mode-string "") (setq mc-write-mode-string "")