Ducati Monster 821 Owner's Manual page 43

Note
If the change of riding mode is associated with
the ABS change of state from "ON" to "OFF" or vice-
versa, the instrument panel also starts the procedure
for disabling or activating the ABS, respectively, upon
confirmation of the selected riding mode.
Note
If at least one error is present upon Riding Mode
change, priority is given to messages "CLOSE GAS"
and "DON'T BRK", and the relevant Warning symbol
will flash.
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