Each "icon" is provided by a module within an add-on. Scrum and Kanban are provided by a module within the Agile add-on, Service Desk by, well, Service Desk and the other three are in the core distribution of JIRA. There is no harm in turning these modules off in the "manage add-ons" section of the administration interface - all they do is provide these "wizards". However, they might be hard to identify, and you must not turn off the whole add-ons they live in, just the modules.
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