open the Flow tab and then open the flow you’re interested in
in the browser’s URL bar, take the last part of the URL (after the last /); this is the unique identifier of your particular flow and looks something like this: 2eecf917-f682-4fe3-8a03-e46c2c9cd85a (but with different numbers/letters)
Would exporting the flow (ALT + rightclick on the flow) yield the same result/information? The export is a text/json file with the technical representation of the flow.