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The Search Editor can be found under System tools → Config Manager → choose product → choose product version → select the tab "Searches" (or something similar depending on the selected language).
The documentation includes a
- Glossary, which defines the concepts used in the Search Editor as well as examples
- How-to guides
- /wiki/spaces/DD/pages/890995008, which guides the reader through very basic functionality
- Use cases, which puts the use of the Search Editor into a practical context.