MacOS – Why can’t I turn off the right click

Not sure if this would help but it was a strange find when troubleshooting the below issue:

1. Shut off wireless mouse
2. Connect USB mouse
3. Check mouse settings to be sure primary button is set to Left, exit settings
4. Disconnect USB mouse
5. Reconnect wireless mouse

In my situation the user was using a new Magic Mouse and MS RDC 2.0.1. In MacOS the buttons work correctly but when the user logged into their RDC session the mouse buttons would switch as if it were taking settings from somewhere else. My theory is that the USB mouse settings had been set to primary button: Right and when you connect the Magic Mouse you can no longer access the same configuration screen but RDC seems to still be using the settings.

Hope this helps!

I spent some more time debugging this, and it seems there are multiple setting locations (on multiple hosts) for the same setting.

AFAICT, each user gets his own host. The login screen uses a separate host. It makes sense to enable some settings (like Trackpad tap to click) for both these hosts.

Furthermore, OS X seems to have separate settings for Magic Trackpads and built-in MacBook Trackpads. The commands in my question only enable the Magic Trackpad settings.

Now, I try to enable it everywhere:

# Map bottom right Trackpad corner to right-click
defaults write com.apple.driver.AppleBluetoothMultitouch.trackpad TrackpadCornerSecondaryClick -int 2
defaults write com.apple.driver.AppleBluetoothMultitouch.trackpad TrackpadRightClick -bool true
defaults -currentHost write NSGlobalDomain com.apple.trackpad.trackpadCornerClickBehavior -int 1
defaults -currentHost write NSGlobalDomain com.apple.trackpad.enableSecondaryClick -bool true