Typically, you would add a LayoutScale min/max to the Event.
Add another condition > System > Compare two values >
First value: LayoutScale
Comparison: < less than
Second value: 2.0
And...
Add another condition > System > Compare two values >
First value: LayoutScale
Comparison: > greater than
Second value: 0.5
Or you can just ctrl-click the first one and drag a copy below it and change the values.