How can i disable some issue type from the list such as Activity and Story
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You will need to remove them from the project configuration, so that they can no longer be used. For Company-managed projects, this is done by amending the "issue type scheme" for the project (which will affect other projects using the scheme), and for Team-managed projects, you remove them from the project configuration directly.
Removing the issue types from a project will prompt you to migrate any existing issues of the removed types to another type that is not being removed.
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