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One of the mandatory things to do in clamshell mode is we need to connect the power cable to the MacBook to be able to use the notebook while the display is closed. Connect power cable to the MacBook or via the USB-C hub.Once the display seems okay you can play around with extended mode. You can change this setting from the control centre once the external monitor is connected or goto display preferences. While first setting up an external monitor it will be smarter to test with mirroring mode enabled instead of extended mode. It is better to test on mirroring mode first than on extended mode.It might seem wiser to make some changes to the MacBook’s default power settings like sleep settings to never sleep while on the power adaptor. – switch on the external monitor to appropriate display mode to adapt to MacBook’s display properties helpful official apple documentation: Using an external monitor with mac – monitors can also be connected directly to the Macbook if compatibles cables are available. – via USB-C hub with HDMI/ VGA/ display adaptors.
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