I've made some progress using the command
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xrandr --output eDP1 --auto --output DP3 --auto --same-as eDP1
but haven't managed to fully replicate what I have, a screenshot of which is provided below.
After executing the xrandr command, I still have a 3x2 configuration, but the second of my columns has disappeared, the third column is in the second column place, and the third column is now empty. Curiously, if I attach the external monitor without executing the xrandr command, the *only* column I can see is the second of my original columns, and my external monitor is an extension of my laptop monitor.
Would most appreciate any help in getting a full replication. Thanks!