The same method for disabling Liquid Glass using FeatureFlags SwiftUI.plist still works in macOS 27 Golden Gate Developer Beta 1!
Unfortunately it has more issues than it did in macOS 26 Tahoe as disabling Liquid Glass causes the Apps list and Spotlight to break entirely.
ALT Desktop screenshot of macOS 27 Developer Beta 1 with Liquid Glass disabled.
It's possible to entirely disable Liquid Glass in macOS 26 Tahoe, there's some visual issues such as the Control Center and the text hover in the dock, but it's mostly usable with the Liquid Glass disabled surprisingly!
If you want to try this yourself... 🧵