The Memory Explorer displays information about memory content.
To display the memory content in your application with the symbol overlay, you must select the Optimize for debugging optimization level in the build configuration. Failing to do so just lists the raw memory in the Memory Explorer.
See the Panel Views page for more information about the UI of the Memory Explorer and the How to work with the Memory Explorer page for detailed information about the actions you can take in this part of the extension, including how to create a custom memory region, which functions as a quick display of the configured memory address.