While the higher-end MacBooks with M1/M2/M3/M4 Pro and Max chips support multiple external displays, the majority of Apple’s lower-end range of MacBooks that use a standard M1 and M2 processor cannot natively connect more than one external monitor, and to do so the M3 has to have its lid closed. This is a massive limitation compared to the previous Intel-based generation of Mac laptops that could run two displays when connected to a USB-C or Thunderbolt 3 docking station or hub.
Apple’s M3 MacBook Air models now support two external monitors (if the MacBook has its lid closed in what is known as Clamshell Mode). The M3 MacBook Pro supports a similar feature, but the macOS Sonoma 14.6 update needs to be installed. We explain how to run dual external displays on an M3 MacBook in a separate article.
Read more at Macworld.com