The simple answer is
or use a Clock with that block similar as shown in the example here Any Marker turn signal ('Blink' or Flash a Map Marker) - #4 by SteveJG for displaying and hiding design time Markers.
The simple answer is
or use a Clock with that block similar as shown in the example here Any Marker turn signal ('Blink' or Flash a Map Marker) - #4 by SteveJG for displaying and hiding design time Markers.