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The previous !conda list output is retained by the notebook as it would with your own code if you wanted to run multiple blocks of code that used different environments that you changed on the fly.
To switch environments from the command line or from a scheduled job you would activate them the typical way.
conda activate name_of_environment
If you are using another users environment (such as your instructors) you will need to use the full filepath of that environment (which can be found in your ~/.conda/environments.txt file via cat ~/.conda/environments.txt)
conda activate /home/kabram/.conda/envs/bmig_6203_test