Hi, @daybrush
Thanks for your amazing moveable component.
In my thought, there are a little issue in Handbook. Maybe, I think, remove "on" is right.

I have used your example code without change.
But, if there is only a target, then group function doesn't work.
I think, a target is also target array with length 1, but it is not working.
If target array length is over than 2, then it is working.

Hope your kind solution to solve this issue.
Many Thanks
@Xumochuan
dragGroup is an event that is triggered when there are two or more targets.
Use the drag event when there is only one target.
https://github.com/daybrush/moveable/blob/master/handbook/handbook.md#angular-example
Thanks, @daybrush
Most helpful comment
@Xumochuan
dragGroup is an event that is triggered when there are two or more targets.
Use the drag event when there is only one target.
https://github.com/daybrush/moveable/blob/master/handbook/handbook.md#angular-example