Resetting the environment restores your instance to the base environment.You can consider resetting the environment if you have installed packages that lead to version incompatibility and start again.
Resetting your environment does not affect your data or code. It will only remove all the user-installed libraries.
Make sure to stop the instance before you reset the environment.
To reset the environment
Go to the 'Settings' tab in the Build.
Scroll down to the 'Danger Zone.'
Select the 'Reset' option.
Type the instance name to confirm and select 'Reset Environment.'