How to get a Dynamic Island on an external monitor
Most Dynamic Island apps for the Mac are built around the MacBook's notch. Plug in an external monitor, close the lid, and there's nothing to attach to, so many of them show nothing at all. Here's what to check before you pick one, and how to set up an island on a monitor with Halo.
Why notch apps go blank on a monitor
A notch app places its island over the camera housing of a MacBook. An external monitor doesn't have one, and with the lid closed macOS doesn't report a notch on any screen. An app that only knows how to sit around the notch either stays on the MacBook's built-in screen or has nowhere to go.
So the first question to ask about any notch app is simple: does it draw its own island on a screen without a notch?
What to look for
- An island on screens without a notch. The app should draw one itself, at the top of the screen, not only on the MacBook.
- Choosing displays. With two or three screens you'll want the island on all of them, on the main one only, or on the ones you pick.
- Lid closed. If you use your MacBook docked, the island has to work with no built-in screen at all.
- Out of the way. On a monitor the island sits in the menu bar, so it should leave the menus around it reachable and hide in fullscreen apps.
- The monitor itself. Your Mac's brightness keys don't change most external monitors. An app that speaks DDC/CI can fix that.
Setting it up with Halo
Halo is a Dynamic Island for the Mac that works with or without a notch. On a MacBook it wraps the notch. On an external monitor it draws its own island at the top of the screen, with the same notifications, music, timers, calls and AI agent status.
- Open Halo's Settings and go to Appearance.
- Under Show Halo on, pick All displays, Main display only, Built-in display only or Displays I choose. Halo remembers each display through unplugging, docking and KVM switches.
- Under Displays Without a Notch, choose the Style: Notch (a black shape that hangs from the top edge, like a real notch) or Floating island (a pill just below the menu bar). Adjust its width and height to taste.
- Optional: turn on Hide when idle on displays without a notch, so the island appears only when something happens or you hover the top of the screen.
Prefer the island on the side of the screen? Pick Left or Right under Position, or drag the island to an edge and let go.
Make the brightness keys work on your monitor
Most external monitors accept brightness, contrast and input commands over DDC/CI, a standard that runs over the same cable as the picture. macOS doesn't send them. Halo does: turn on Control external monitors (DDC/CI) in Settings › Keys & Displays, and the brightness keys change the monitor under your pointer, with the level shown in the island. This needs an Apple silicon Mac. The monitor brightness guide covers the details, including monitors that don't respond.
Which one to pick
- You only use your MacBook's own screen: any notch app works. The notch app comparison covers seven of them.
- You use a monitor, or work with the lid closed: pick one that draws its own island, like Halo, and check that it lets you choose displays.
Questions
Is there a Dynamic Island for an external monitor on Mac?
Not from Apple. Apps like Halo draw their own island at the top of a screen that has no notch, so it works on external monitors and with the MacBook's lid closed.
Does Halo work with the MacBook lid closed?
Yes. With the lid closed, Halo shows its island on the external monitor, styled as a notch or a floating island.
Can I show the island on only one of my monitors?
Yes. In Settings › Appearance, Show Halo on lets you pick all displays, the main display, the built-in display, or the displays you choose.
Will the island cover menus in the menu bar?
No. When the pointer heads for a menu beside the island, the island steps aside so the menu stays reachable, and it hides in fullscreen apps.
Can Halo change my monitor's brightness?
Yes, on Apple silicon Macs, for monitors that support DDC/CI: the brightness keys change the monitor under your pointer. Halo can also change contrast and switch the monitor's input.
More guides: External monitor brightness on a Mac · Best Mac notch apps in 2026 · All guides
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