To permanently include packages or folder into the PYTHONPATH of an Anaconda environment, activate the Conda environment and use [conda develop](https://docs.conda.io/projects/conda-build/en/latest/resources/commands/conda-develop.html) to add the path permanently to the PYTHONPATH of the Conda environment.
conda develop /PATH/TO/YOUR/FOLDER/WITH/MODULES This command will create file named conda.pth file the site-packages folder of your environment.
~/anaconda3/envs/YOUR_ENV/lib/pythonX.X/site-packages
As an alternative, you can just add a conda.pth file in ~/anaconda3/envs/YOUR_ENV/lib/pythonX.X/site-packages with the folder that you want to include in your PYTHONPATH.