You can delete a conda environment using the Package Manager page.
Hinweis:
To delete the active environment, activate a different environment first.
The default arcgispro-py3 environment cannot be deleted.
- On the ribbon, click the Project tab.The settings page appears. 
- In the list of side tabs, click Package Manager.The Package Manager page appears. 
- Click the Environment Manager button  . .The Environment Manager dialog box appears. 
- Click the options button  on the row representing the environment you want to delete, and click the Delete button  . .A warning message appears. 
- Click OK.
The environment is deleted.