You can see your total Gmail, G-Drive and Team Drive storage sizes following these steps:
- Log in to your G-Suite environment as an administrator, and select Reports
- On the left menu choose Reports >> Accounts
- Scroll down till you see the Storage used by apps section
- On the displayed page you can find the storage size by moving the mouse over the rightmost point on the graph. The actual utilized storage size for Gmail, G-Drive and Team Drive (Shared Drive) is then displayed
