You can use this event to change the size of the objects inside a group. The new size must be expressed as floating point values relative to the current size of the group objects. A value smaller than 1.0 shrinks the objects, a value greater than 1.0 enlarges the objects, a value of 1.0 means no change. 0.0 and negative values are not allowed. You can specify separate scaling values for the x and y axes.
It is also possible to only change the width or the height of the group objects. You can achieve that by simply leaving one of the text widgets empty.
You can also use variable names instead of numeric constants with this action event. It is even possible to enter complete expressions like "x+1" or function calls for maximum flexibility here.
Also note that the group objects will be scaled relative to their anchor point which is usually set at 0.5/0.5 which means that scaling is done around the object's center point.