From the Initial Screen of Glue Data Dictionary, it is possible to use the "Where-used" functionality for a specific Glue table (Figure: Glue Dictionary - Where-used). By clicking on the "Where-used" button, a popup window comes up with all occurrences of the Glue table in Glue Extractors and InfoProviders (Figure: Where-used List).
Glue Dictionary - Where-used
By double-clicking on a specific item in the list, the selected Extractor/InfoProvider is open.
Where-used List