Thats not quite what I mean.
If you
highlight the group you want, then the list of devices in that group populate in the device list pane. If you don't have groups, then the Default group is all your devices anyway.
Select all these devices listed by clicking the checkbox in the
column heading (next to the word "status" in the headings at the top of the list). That ticks all the checkboxes below it for the currently listed devices that match the given filter. The top right-hand "actions" pulldown now becomes available and performs that action on all the selected devices. So Be careful
Clicking the check-box next to only the group name performs actions on the group container, not on the devices within it. Perhaps not that intuitive.