If your Mac is from 2011 to around 2016, chances are it offers Thunderbolt 1 or 2 rather than Mini DisplayPort, although the two are compatible. If you see a Thunderbolt symbol besides what looks like a Mini DisplayPort, your Mac has a Thunderbolt port. The Thunderbolt port looks the same as Mini DisplayPort (below) and is backwards-compatible with that port. Thunderbolt first appeared on Macs in around 2011, then in 2013 Apple introduced Thunderbolt 2. A USB 4 port can only support one display, while Thunderbolt 4 can support two 4K displays. Thunderbolt 4 will always have a full 40Gbps bandwidth, while USB 4 starts at 20Gbps, but can also reach Thunderbolt 4’s 40Gbps. There isn’t a huge difference between USB 4 and Thunderbolt 4, and Thunderbolt 4 devices support USB 4. If you are adding a second monitor to a Mac mini you will see something like this: The options are a little different if you are attaching a desktop Mac, like a Mac mini, to a monitor as it doesn’t have it’s own display. You can also select ‘Show mirroring options in the menu bar when available’ and you will see a status menu in the menu bar making it easier to turn this off and on again.If you want to mirror the display on both (or multiple) displays go to System Preferences > Displays > Arrangement and choose Mirror Displays.Drag this white bar to the screen you wish to be dominant. A white menu bar will be shown at the top of one of the screens.Drag the illustrated displays into the arrangement you require.Do not select the Mirror Displays tickbox (unless you want the second screen to show the same content as your original screen).
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