The Extract data from window action is not able to extract data in a form of a data table like the Extract data from web page is able to do for web pages. It will only be able to extract a single string/blob of text, assuming that your application actually allows that. As such, I usually prefer using the Get details of element in window as it does the same thing and usually works better (and also has more options as to what to extract).
If you need to extract a table, you will likely need to extract every single value individually and then add them to a data table inside your flow.
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