MacRumors Article
Apple's Secret Siri Interface Buried in macOS 27 Beta: How to Enable
https://www.macrumors.com/2026/07/20/secret-siri-interface-macos-27-beta-enable/
Here's a summary.
Apple appears to be testing a hidden popover-style Siri AI interface in macOS 27 beta, where users can select text and it shows contextually relevant tasks along with 'Writing Tools'.
Tools like Rewrite, Proofread, How does this sound?, Edit with Siri appear, and it also supports key takeaways extraction and text summarization.
[See attached video in the Reddit r/MacOSBeta post below]
https://www.reddit.com/r/MacOSBeta/comments/1v0hvjd/
In macOS 27 Developer Beta 3 and Public Beta 1, the Siri popover is disabled by default. You can enable it with the commands below, but keep in mind that this is still a work-in-progress feature and some functionalities may not respond at all.
sudo mkdir -p /Library/Preferences/FeatureFlags/Domain && sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macOS -dict Enabled -bool true
To disable:
sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macOS -dict Enabled -bool false
