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And Chromium/Electron apps like Brave, Slack, VS Code, and Discord draw their own window chrome — the global write literally can't reach them, same for a couple of Catalyst apps.

VS Code and Discord are respecting the corner radius setting for me. Chrome does not, but Opera does. Got to just check every app. At the very least, using this setting makes things much more consistent than it was before.
 
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Fresh 26.5.2 install, with corner radii (et al.) applied.

QuickLook windows, message links, etc. are still rounded to Tahoe defaults.

Screenshot 2026-07-15 at 10.45.12.png
 
These terminal commands will disable the floating sidebar (first one) and set the window corner radius back to how it was in Sequoia (second one). To see the effect you have to close and relaunch your app after running the commands. (Log out and log back in to clean up "everything".)

defaults write -g NSSplitViewItemSidebarDefaultsToFloatingAppearance -bool false
defaults write -g NSConvolutionOverride1 -float 10

If you want to set things back to "default", use:

defaults delete -g NSSplitViewItemSidebarDefaultsToFloatingAppearance
defaults delete -g NSConvolutionOverride1

Good god, what an improvement! The Finder sidebar in particular is such an eyesore in Tahoe's default state.
Thanks so much for pointing these out!
 
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