@fchopo
Thank you for your reply. I have reviewed the thread. I've found it confusing since there are so many messages in it but I have made a little more progress. The Filter Array appears to be working correctly.
As configured in the attached image, I was able to see the output of the filter array to be correct. I am using not(empty(item()>['Account'])) as the value in the left field -- to find if the value is not empty (= true). When I use the condition "is equal to", the flow will create a Filter Array of only the non-blank rows in my table, and then move on to delete all of the non-blank rows, leaving only the blank rows.
However assuming that I want the blank rows removed instead, I change the condition to "is not equal to" and then the Filter Array find all the blank rows, but the delete rows gives an Status Code 404 error with a Message of "Resource Not Found". Do you know why this is happening and how to delete the rows where "Account" is blank?