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The Task Management application is packaged as an add-on, so you need to install it first. Refer to this guide for more details.
To define a default workflow for new projects in the Task Management application, you can configure a property named exo.tasks.default.status via exo.properties file.
For instance:
exo.tasks.default.status=To Do, In Progress, Wait, Validate, Done
in which, each status in the workflow is separated by a comma.