This question is in reference to Atlassian Documentation: Administer your site
I would like to reset the workflows or the hole system... cause I made some testchanges and would like to start again.
There is no 'return to factory settings' If you made a backup you can restore from that. Otherwise you'll have to reinstall. I suggest, going forward, never altering any of the default workflows or schemes so they can always be used as a reference. Make copies and work with them. I use that philosophy with all COTS products.
You can't alter the default JIRA workflow, so that's not a problem. As for the others that you can end up with in later versions of JIRA, as Joe says, there is no "reset", but they are all created from hard-coded presets. When you create a new scrum/kanban/service-desk/business project, the workflow you get for it is fixed and is effectively the "factory setting". So you could create a new project of the desired type and use the newly created workflow to replace the ones you've changed.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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