Liquid Glass can be disabled in macOS 26 using a feature flag

TidBITS Talk
1

You can disable Liquid Glass in macOS 26 using a feature flag. But who knows for how long now that this info is public.

  • defaults write -g com.apple.SwiftUI.DisableSolarium -bool YES

https://bsky.app/profile/bobpony.com/post/3m2dfzw5um22l

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Or you can disable it for certain apps. This will save you from the few OS-wide visual issues referred to in the Bluesky post above.

  • defaults write com.apple.finder com.apple.SwiftUI.DisableSolarium -bool YES
  • defaults write com.apple.Preview com.apple.SwiftUI.DisableSolarium -bool YES
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