While the higher-end MacBooks with M1/M2/M3 Pro and Max chips support multiple external displays, the majority of Apple’s lower-end range of MacBooks that use a standard M1, M2 or M3 processor cannot natively connect more than one external monitor. 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 latest M3 MacBook Air models do now support two external monitors (if the MacBook has its lid closed in what is known as Clamshell Mode), but not the older M3 MacBook Pro, even though it boasts an HDMI port unlike the Air models. Apple has promised to rectify this M3 MacBook Pro limitation in a future macOS update but no date has yet been announced for this.
Read more at Macworld.com