Dear Offirh,
Good day! Thank you for posting in our community. Your question is "Exporting List View to Excel Includes Hidden Source Fields Used in Calculated Columns".
As per your description, we did the test on our end and we could reproduce the issue as well.
We created "first name" "last name" and "full name"(calculated column) in the list.
And then we created a different view to hide "first name" and "last name". In this view, we clicked "export to excel" option.
When opening the file, it still shows those 2 columns at end.
Since issue can be reproduced, we believe this is the product design related. We are not able to directly change the behavior from user end. As a workaround, I found "export to csv" option is working as expected. Kindly check the exporting result below and consider using this option as replacement.
Thank you for your cooperation and have a nice day!
Best Regards,