Hi Marcello,
Thank you for contacting us.
It appears the Dodocool 7-in-1 USB-C is not a DisplayLink product. Instead, it uses a USB alternative mode to connect an HDMI display by utilizing your MacBook's GPU. As MacBook Air M1 supports only one external display, just one connected externally will function.
To use two screens at the same time, you would need an adapter or docking station that uses DisplayLink technology.
Regards,
Szymon
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