I like keeping the macOS Dock at the default size but sometimes I fat-finger with the trackpad and accidentally resize. It’s a shame there is no obvious way to change it back to the default. Fortunately someone figured out the default value of the dock size; you can restore the size with the following command:
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defaults write com.apple.dock tilesize -integer 64; killall Dock |
You can also disable resizing entirely with:
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defaults write com.apple.dock size-immutable -bool yes; killall Dock |