Add types to start event camunda

How to add a few additional BPMN elements there? Escalation, Compensation and Error events.

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You have to create a custom replace menu provider. Please see this thread for more information.

Thank you for your answer.
Maybe you have an example of adding additional elements?

Or how can I unlock Parallel Multiple and Multiply events?

There is no dedicated example of updating the replace menu options. However, depending on your use case, you can be inspired by

See my reply in one of your other topics about the same topic: Unknown type <bpmn:MultipleEventDefinition>