You can log out or switch practice by clicking your initials on the bottom left of the page:
You should log out after each session.
Initials tell you who is logged in
The initials of the current user who is logged in is displayed on the user profile button at the bottom left of the page.
Log out via the user profile button
Click the user profile button at the bottom left of the page, and click Log out.
Access your other practice database via the user profile button
Click the user profile button on the bottom left of the page in the left menu bar.
Select Change practice.
Select the practice you want to access from the list.
Click Select practice.