That is called Element Binding.
In my opinion the best way is to uncheck all options inder Dynamo > Binding Data Storage:
But there are situations where you want to update previously generated objects (but I’ve not been in that situation so far).
With unchecking all options, they newly created objects are only updated while you have the graph open and rerun it in the same session. After reopening the graph, the previously created objects will remain.