In 'Monitor > CH1' menu you can set various output conditions for Volts, Current and Power, as well as, (after pushing the 'Settings' button) three actions (to be selected independently): 'Output Off', 'Warning' and/or 'Beeper'.
So fare Output Off and Warning are working great in my instrument. However no 'Beeper' tone ever triggered.
So if you want to be only warned of some output conditions, you can select checkbox 'Warning', while leaving 'Output Off' unchecked.
You are right that after the first message 'Monitor Warning', monitoring switches off, but otherwise you will be 'spammed' the same message again and again (on screen and in the LOG). For the 'Beeper' however this behaviour is not needed. Maybe this is the reason why the 'Monitor' option is not officially released yet?