# Lock / Unlock Screen

The lock screen command will **mute** and **disable all Chrome windows** on your student's device. The command is designed to unlock at the end of the session, but if a student joins a new session before the first session ends, they will remain locked.

##### **To lock a student's screen:** 

1. Select one or more students using the checkbox to the left of each student's name
2. Click the **Lock / Unlock device** button
3. (Optional) enter a custom message to be displayed on the locked screen
4. Click **Lock** devices on the **Lock / Unlock** Devices confirmation popup window

![image.png](https://wiki.mdy.org/uploads/images/gallery/2024-07/scaled-1680-/YsemIDQWINnRLq4h-image.png)

Devices may also be locked or unlocked by clicking the Lock / Unlock device button on the command bar and then making lock / unlock selections.

![image.png](https://wiki.mdy.org/uploads/images/gallery/2024-07/scaled-1680-/kLSRJNilxyJeynLT-image.png)

##### **To unlock a student's screen:**

1. Select one or more students using the checkbox to the left of each student's name
2. Click the **Lock / Unlock** device button
3. On the **Lock / Unlock** devices popup window, click the **Unlock** button
4. Confirm by clicking the **Unlock** devices button

![image.png](https://wiki.mdy.org/uploads/images/gallery/2024-07/scaled-1680-/HWbwHp4T9MRe1ljc-image.png)

<span style="color: rgb(224, 62, 45);">If the student's device does not unlock after 30 seconds, reboot the student's device, wait for the student to connect to the session, and then issue the unlock command again.</span>