Is there a way to pull all data fields available in Eikon (as seen in Data Item Browser or the Screener app as columns) into a comprehensive excel file?
Unfortunately, it is not possible to export the list of all fields (same as Data Item Browser) to a csv or xlsx file.
I suggest that you connect Refinitiv Content Helpdesk to try to get a full list of field.
The Refinitiv Content Helpdesk can be reached using Contact Us capability in your Eikon application.
Or by calling the Helpdesk number in your country.
Or at https://my.refinitiv.com/