cenv uses the path /opt/conda as default conda-installation-folder and /shared/conda/envs as default conda-environments-folder.
You can overwrite these settings with a cenv.yml at ~/.config/cenv/cenv.yml with the following content:
conda_folder: /opt/conda env_folder: /shared/conda/envs export_environment_yml: false
There you can define your own conda-installation-path and the conda-environments-folder. The functionality to export the created / updated environment into a environment.yml can be activated / deactivated here, too. Per default it is deactivated. If this is activated, the environment.yml will be placed at conda-build/environment.yml.