Modify window appearance in macOS Tahoe

If you dislike the new Finder and window appearance in macOS Tahoe, you can revert to the Sequoia UI using the following commands. This will disable the floating sidebar and decrease the corner radius :

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

For square corners :

defaults write -g NSConvolutionOverride1 -float 1
killall Finder

To revert all back :

defaults delete -g NSSplitViewItemSidebarDefaultsToFloatingAppearance
defaults delete -g NSConvolutionOverride1
killall Finder