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On a Mac, I used to be able to secondary-click using a two-finger tap. Currently, I can only secondary-click using a two-finger click, not a tap.

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Is there a way to alt-click using a two-finger tap instead of a click?

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    You didn't state what kind of Mac or what macOS version you're using. I have a 2015 MBP running Mojave 10.14.4 and the 2 finger tap works as a secondary click. I have the option Click or tap with two fingers. – fsb Apr 24 at 19:22
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There are 3 checkboxes in the top of the Preference pane you show as a screenshot. The third one, which you have unchecked, enables "tap to click" - turn this option on and you'll be set. If that one is off, you must click (rather than tap) for all other options shown. Trackpad preference panel

  • thank you, not sure why I didn't see this, I toyed with the settings for 10 minutes lol – Alexander Mills Apr 26 at 3:30
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I have a MBP 2018 with Mojave on it and I have that same dialog like this:

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I find it easier to look at the trackpad options using the defaults command vs. navigating the dialogs that have become a confusing mess going from one version to another of macOS. On my system I have the settings like this:

$ defaults read com.apple.AppleMultitouchTrackpad
{
    ActuateDetents = 1;
    Clicking = 1;
    DragLock = 0;
    Dragging = 0;
    FirstClickThreshold = 1;
    ForceSuppressed = 0;
    SecondClickThreshold = 1;
    TrackpadCornerSecondaryClick = 0;
    TrackpadFiveFingerPinchGesture = 2;
    TrackpadFourFingerHorizSwipeGesture = 2;
    TrackpadFourFingerPinchGesture = 2;
    TrackpadFourFingerVertSwipeGesture = 2;
    TrackpadHandResting = 1;
    TrackpadHorizScroll = 1;
    TrackpadMomentumScroll = 1;
    TrackpadPinch = 1;
    TrackpadRightClick = 1;
    TrackpadRotate = 1;
    TrackpadScroll = 1;
    TrackpadThreeFingerDrag = 1;
    TrackpadThreeFingerHorizSwipeGesture = 0;
    TrackpadThreeFingerTapGesture = 0;
    TrackpadThreeFingerVertSwipeGesture = 0;
    TrackpadTwoFingerDoubleTapGesture = 1;
    TrackpadTwoFingerFromRightEdgeSwipeGesture = 3;
    USBMouseStopsTrackpad = 0;
    UserPreferences = 1;
    version = 12;
}

I'd compare your settings with mine to see what's amiss. If you find one of the settings is different you can use defaults to change it as well.

Example

Here I'm merely cycling the values for the property FirstClickThreshold to illustrate how one can use defaults to write and then read values.

$ defaults read com.apple.AppleMultitouchTrackpad | grep FirstClickThreshold
    FirstClickThreshold = 1;

$ defaults write com.apple.AppleMultitouchTrackpad FirstClickThreshold 0
$ defaults read com.apple.AppleMultitouchTrackpad | grep FirstClickThreshold
    FirstClickThreshold = 0;

$ defaults write com.apple.AppleMultitouchTrackpad FirstClickThreshold 1
$ defaults read com.apple.AppleMultitouchTrackpad | grep FirstClickThreshold
    FirstClickThreshold = 1;

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