Install Lefty, a macOS menu-bar app that mirrors system cursors for left-handed users:
brew tap pol-cova/lefty
brew install --cask pol-cova/lefty/leftyHomebrew asks you to tap this third-party repository explicitly before installing its cask.
The current binary is not notarized. macOS may require Open Anyway on first launch.
Uninstall with:
brew uninstall --cask lefty