I assume you mean Activity when mentioning Action.
It is debatable whether or not resizing activities is something good or not because size always transport additional semantics (i.e. bigger = more important). That is why we do not allow resizing activities per default. We may change our minds in the future though.
You can do two things to circumvent this issue at the current point in time:
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Roll your own BPMN Modeler using our toolkit and allow resizing of tasks. This extension, for example, makes your tasks resizable.
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Use shorter labels