alt Hacker NewsDon't know if this is what you want to do or not, but you can actually change app icons for Applications however you like if you have the alternate that you want it to be. I'll tell you how
Applications Folder (in Finder) -> Right-click on the target app -> Get Info -> Drag-and-drop the intended icon file to the top-left corner where the original icon is present.
Ik it's just a way to customise and not something official but your Mac looks the way you want it to.
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Interesting... I had used this trick many times in the past, but assumed that with Tahoe it would put the icon in the little squircle jail it puts other default icons in if they don't conform to the new standards. Those end up looking really bad. I just tried it with a non-conforming icon and it seems to work.
Time to go icon hunting.
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Even Apple has forgotten about this it seems. There are various places in the UI where this change is not respected, e.g. Stage Manager.