For the trigger in scenes in the Shelly Cloud App there is the item Condition Type.
Here is a short explanation of the meaning of the three choices.
On time:
Here the scene is started as soon as the >When< state is detected. Only after the scene has run through completely, the scene can be restarted by changing the >When< state.
If you additionally insert a time in the On time field below and in the Condition is valid field, the scene will not be started until the >When<state has existed for at least this time.
Repeatedly:
Here, the >When<state is constantly queried every full minute. And all set >DO< also every minute if the When is not changed.
On any change:
Here, with every new state of the >When<, the scene is started anew. Even if the originally started scene has not yet run out.