Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 152)

VIVOTEK - A Leading Provider of Multimedia Communication Solutions
152 - User's Manual
The same applies to the thumbnail view. To leave the group alarm view, click the Group alarm button
again.
When the alarm-triggered action is configured as sounded alarm, you can mute all alarms in the group
by clicking the alarm sound icon.