Felix,
Thanks for the reply. About an hour or so after setting up the Arduino tools for the M5 Stack, I downloaded the M5Tough repository with a Zip file and extracted to the Arduino libraries and came across and recognized the "Factory Test" as the "M5TOUGH TOOLS" source code. Where that code was in the M5Tough-master
Then when trying to compile it, I found I also had to download and drop in the code from github for M5Unified-master, M5GFX-master to get the build to complete OK. While at it, I also downloaded the M5Stack-master for other examples as well.
With building the Factory Test program, I was able to go back and forth between "Hello World" and the Factory Test, so I'm a happy camper.
One thing I did notice is that Factory Test program is quite extensive and for some reason, when I did a "Save as" to try and make modifications, it no longer compiled (looks like maybe some path/setup issue in looking for files).
So I'll try and solve that some other time, I'm up and running now and so far, I like what I see.
Thanks and best regards,
Alan
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