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Any chance that there's a command for QuickLook? Those rounded corners are also driving me insane and it seems Apple is not changing that even in Golden Gate.....
 
Wait. This works for Tahoe too? Going to go and mess with it...

[Edit]
It works!! Whoo.
Floating sidebar off, window corner radius set back to 10.

I tried an even smaller corner radius but some apps look weird in the corner if you set it to less than 10. Like, they don't paint all of the way out to the squared-off corner, so you can see some rounding "inside" of the window.

[Edit 2]
Disabling the floating sidebar seems to work in some apps (Finder, Calendar, Reminders, Notes) but not others (Weather, Maps, Find My).
 
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Works in Golden Gate and also applies to dialogue and alert windows. Setting the default to 10 tapers the windows as they should be.

Sadly, the radius does not apply to Quick Look windows, so parts of photo and document previews remain cut off.

Setting it to 1 looks great on the bottom corners, but the top corners are funky.
Top corner.png


Bottom corner.png


If the top and bottom corners could be controlled independently of each other, creating those nicely balanced windows from 10.2 would be possible. Slightly rounded top corners and straight bottom corners would also match Apple's laptop screens more closely. An Inc. can dream.

For users stuck on Tahoe, having the ability to change these settings might make that OS a bit more palatable.

Is it possible to change the corner radius of the Dock?
 
Want extreme radius? I tried so you don't have to - as at one point it will break windowing...

Set radius to 200

1783121717543.png


...or 240

1783121766246.jpeg


If you set it to 300, then corners will meet each other

1783121825638.jpeg


but 260 broke windowing to level where all windows were just like that outer empty shape in last picture (literally empty inside). I did it in VM to not mess with actual system. As there was only one user and no usable windows, I had to "blindly" operate in terminal with "arrow up" shell history and entering more realistic value and I got my windows back to normal again.

Biggest obvious problem with so big radius values was that corners were cut to level where traffic light buttons were gone and it was impossible to grab window corners for resizing...
 
Why do we only learn about this at the end of Tahoe's lifecycle?

If you haven't read the Reddit link (which I can't blame you for), there's also a setting to turn off the floating sidebar:
Code:
defaults write -g NSSplitViewItemSidebarDefaultsToFloatingAppearance -bool false
 
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