Unable to see Response Body in JMeter, View Results Tree listener

The changes you've made don't have any impact onto View Results Tree listener output, they are only for .jtl results files.

Try the following:

1. Run your JMeter test in command-line non-GUI mode like

   jmeter -n -t test.jmx -l result.xml
   

   and open result.xml file with your faviourite text or XML viewer/editor. You should see something like:

   <?xml version="1.0" encoding="UTF-8"?>
   <testResults version="1.2">
       <httpSample t="93" it="0" lt="93" ct="42" ts="1568029799118" s="true" lb="HTTP Request" rc="200" rm="OK" tn="Thread Group 1-1" dt="text" by="759" sby="139" ng="1" na="1">
           <responseData class="java.lang.String">{
               &quot;userId&quot;: 1,
               &quot;id&quot;: 1,
               &quot;title&quot;: &quot;delectus aut autem&quot;,
               &quot;completed&quot;: false
               }</responseData>
           <java.net.URL>http://jsonplaceholder.typicode.com/todos/1</java.net.URL>
       </httpSample>
   
   </testResults>
   

   where responseData tag contains XML-escaped response data. If there is some data in the file - most probably something is wrong with your JMeter installation, try re-installing it by downloading JMeter from the official website as the Brew package might be broken.

2. Check jmeter.log file contents, if anything goes wrong JMeter normally writes a log message with the results.