Either look through the list of devices, or use the "Search" box at the top to search for the device name:
From the Device
Open the Settings application - Either by going to the Start menu and click the Settings button: Or by typing "Settings" into the search and open the Settings application:
Click on "Accounts":
Click on "Access work or school":
If it is connected you should see "Connected to Clinical School Computing Service's Azure AD":
If there is nothing underneath "Connect" then it is likely not connected.