Disabling Cloud Shell for managed user accounts
Cloud Shell can be disabled for G Suite and Cloud Identity managed user accounts. This can be done by going to the Google Admin console and then navigating to Apps > Additional Google services > Google Cloud Platform > Cloud Shell Settings and disabling "Cloud Shell Access Settings".
Resetting Cloud Shell
To restore your Cloud Shell home directory to a clean state:
Check for personal files in the home directory:
ls -a $HOME
Remove all files from your home directory:
sudo rm -rf $HOME
In the Cloud Shell menu, click the three dots menu icon, then click Restart Cloud Shell.
Click Restart Cloud Shell in the confirmation dialog.
A new VM will be provisioned and the home directory will be restored to its default state.