macOS 10.15 Said to Feature 'Luna Display-Like' Desktop Extension Functionality

macOS 10.15 will have a new feature that allows users to send any window of any app to an external display, according to 9to5Mac's Guilherme Rambo. The external display can supposedly be a monitor connected to the Mac or even an iPad.

luna display macbook

Luna Display

The report claims this functionality will be accessible via a new menu that can be opened by hovering over the green "maximize" button in a Mac app window for a split second. The menu is expected to provide options for making windows full-screen, tiling windows, and moving windows to external displays.

The feature, codenamed "Sidecar," is said to be similar to the Luna Display hardware solution that turns an ‌iPad‌ into a second display for the Mac.


Users with an ‌iPad‌ that supports Apple Pencil will be able to draw with the Pencil when the ‌iPad‌ is being used as an external display for the Mac, effectively "turning the ‌iPad‌ into a Wacom-like tablet," according to the report.

The report claims Apple is also working on options that will allow windows to be easily snapped to one side of the screen.

Related Forum: macOS Catalina

Popular Stories

iOS 26

15 New Things Your iPhone Can Do in iOS 26.2

Friday December 5, 2025 9:40 am PST by
Apple is about to release iOS 26.2, the second major point update for iPhones since iOS 26 was rolled out in September, and there are at least 15 notable changes and improvements worth checking out. We've rounded them up below. Apple is expected to roll out iOS 26.2 to compatible devices sometime between December 8 and December 16. When the update drops, you can check Apple's servers for the ...
Intel Inside iPhone Feature

Apple's Return to Intel Rumored to Extend to iPhone

Friday December 5, 2025 10:08 am PST by
Intel is expected to begin supplying some Mac and iPad chips in a few years, and the latest rumor claims the partnership might extend to the iPhone. In a research note with investment firm GF Securities this week, obtained by MacRumors, analyst Jeff Pu said he and his colleagues "now expect" Intel to reach a supply deal with Apple for at least some non-pro iPhone chips starting in 2028....
Photos App Icon Liquid Glass

John Gruber Shares Scathing Commentary About Apple's Departing Software Design Chief

Thursday December 4, 2025 9:30 am PST by
In a statement shared with Bloomberg on Wednesday, Apple confirmed that its software design chief Alan Dye will be leaving. Apple said Dye will be succeeded by Stephen Lemay, who has been a software designer at the company since 1999. Meta CEO Mark Zuckerberg announced that Dye will lead a new creative studio within the company's AR/VR division Reality Labs. On his blog Daring Fireball,...
ive and altman

Jony Ive's OpenAI Device Barred From Using 'io' Name

Friday December 5, 2025 6:22 am PST by
A U.S. appeals court has upheld a temporary restraining order that prevents OpenAI and Jony Ive's new hardware venture from using the name "io" for products similar to those planned by AI audio startup iyO, Bloomberg Law reports. iyO sued OpenAI earlier this year after the latter announced its partnership with Ive's new firm, arguing that OpenAI's planned "io" branding was too close to its...
iOS 26

Apple Seeds iOS 26.2 and iPadOS 26.2 Release Candidates to Developers and Public Beta Testers

Wednesday December 3, 2025 10:33 am PST by
Apple today seeded the release candidate versions of upcoming iOS 26.2 and iPadOS 26.2 updates to developers and public beta testers, with the software coming two weeks after Apple seeded the third betas. The release candidates represent the final versions of iOS 26.2 and iPadOS 26.2 that will be provided to the public if no further bugs are found during this final week of testing....
iphone air camera

iPhone Air's Resale Value Has Dropped Dramatically, Data Shows

Thursday December 4, 2025 5:27 am PST by
The iPhone Air has recorded the steepest early resale value drop of any iPhone model in years, with new data showing that several configurations have lost almost 50% of their value within ten weeks of launch. According to a ten-week analysis published by SellCell, Apple's latest lineup is showing a pronounced split in resale performance between the iPhone 17 models and the iPhone Air....
iPhone 17 Pro Cosmic Orange

iPhone 17 Pro Lost a Camera Feature Pro Models Have Had Since 2020

Thursday December 4, 2025 5:18 am PST by
iPhone 17 Pro models, it turns out, can't take photos in Night mode when Portrait mode is selected in the Camera app – a capability that's been available on Apple's Pro devices since the iPhone 12 Pro in 2020. If you're an iPhone 17 Pro or iPhone 17 Pro Max owner, try it for yourself: Open the Camera app with Photo selected in the carousel, then cover the rear lenses with your hand to...
ios 18 to ios 26 upgrade

Apple Pushes iPhone Users Still on iOS 18 to Upgrade to iOS 26

Tuesday December 2, 2025 11:09 am PST by
Apple is encouraging iPhone users who are still running iOS 18 to upgrade to iOS 26 by making the iOS 26 software upgrade option more prominent. Since iOS 26 launched in September, it has been displayed as an optional upgrade at the bottom of the Software Update interface in the Settings app. iOS 18 has been the default operating system option, and users running iOS 18 have seen iOS 18...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
iPhone 17 Pro Cosmic Orange

10 Reasons to Wait for Next Year's iPhone 18 Pro

Monday December 1, 2025 2:40 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...

Top Rated Comments

critter13 Avatar
87 months ago
as long as this doesn't require brand new iPads it could help breathe some life into older ones. great codename btw, "sidecar", nailed it.
Score: 18 Votes (Like | Disagree)
cmaier Avatar
87 months ago
There are also indications (stroughton smith) that you’ll be able to combine with handoff-like functionality. In other words, when working with an app on the mac, send it to your iPad, and it can actually launch the ipad version of the app and populate it with the app state so you can keep working on your ipad without being anywhere near the mac. With marzipan, many ipad apps will be identical code to their mac versions, which will make this much easier for developers to support.
Score: 9 Votes (Like | Disagree)
EvilEvil Avatar
87 months ago
Finally a useful feature from Apple!
Score: 8 Votes (Like | Disagree)
PBG4 Dude Avatar
87 months ago
Awesome! Can’t wait for these features to be added.
Score: 6 Votes (Like | Disagree)
uajafd Avatar
87 months ago
I just can see Luna Display yanked from the App Store for "duplicating the core functionality" in 3... 2... 1...
Score: 6 Votes (Like | Disagree)
PickUrPoison Avatar
87 months ago
As much as I love BTT, if those features are built in to macOS, it’ll go the path of F.Lux.
Maybe BetterSnapTool will, but BTT also has all the TouchBar and mouse/trackpad/keyboard customizations so I think it’ll still be around.
Score: 6 Votes (Like | Disagree)