I also have the same problem. Annoying as I purchased the U2520D because of its Audio as well as the color capabilities. Very annoying! I am using solely USB Type-C connections.
The online U2520D User's Guide shows us that the U2520D Menu does not have any Audio On/Off settings. So the macOS controls its audio out into the U2520D. External powered speakers must be connected to the U2520D Audio Line-out port. Then look in the macOS audio settings for the U2520D to choose it as the default audio output device.
DELL-Chris M
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Posted May 4th, 2021 07:00
The online U2520D User's Guide shows us that the U2520D Menu does not have any Audio On/Off settings. So the macOS controls its audio out into the U2520D. External powered speakers must be connected to the U2520D Audio Line-out port. Then look in the macOS audio settings for the U2520D to choose it as the default audio output device.
DELL-Chris M (old account)
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