Here's how to turn on three finger drag if your Mac has a Force Touch trackpad.
- From the Apple menu, choose System Preferences.
- Click the Accessibility icon.
- Choose Mouse & Trackpad from the options on the left.
- Click Trackpad Options.
- Place a tick next to "Enable dragging".
- From the related pop-up menu, select “three-finger drag” so there's a tick next to it.
- Click OK.