Lenovo ThinkPad Thunderbolt 4 Workstation Dock User Manual page 16

4. The computer can play back flash content. However, when I drag the window to the external
display and maximize the window, the playback stops.
Update your Adobe Flash Player program to the latest version.
Audio output
Sound does not come from the headset after connected to the dock.
Ensure that the dock is set as the default audio device:
1. Right-click the speaker icon in the Windows notification area and select Playback devices. The Sound
window is displayed.
2. On the Playback tab, select the dock. Then click Set Default.
3. Click the Recording tab. Select the dock. Then click Set Default.
4. Click OK.
Note: You might need to restart the application that is using the audio device to apply the changes.
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ThinkPad Universal Thunderbolt 4 Dock ThinkPad Thunderbolt 4 Workstation Dock User Guide