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A Thunderbolt 3 or Thunderbolt 4 hub can enable up to 2 displays over a single Thunderbolt port, but does not increase the maximum number of displays that you can connect. Connect the display with the highest resolution first. The MacBook Air with M4 chip supports up to two external displays simultaneously with the built-in display, based on the resolution and refresh rate of each external display. It supports one external display up to a native resolution of 8K (7680 x 4320) at 60 Hz or 4K (3840 x 2160) at 240 Hz or two external displays up to a native resolution of 6K (6144 x 3456) at 60 Hz or 4K (3840 x 2160) at 144 Hz. I have used both a Caldigit TS3 Plus and a CalDigit TS4 dock with dual 4K 60 Hz monitors over DisplayPort and USB-C.
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