Change Mouse & Trackpad preferences for accessibility on Mac
On your Mac, use the Mouse & Trackpad pane of Accessibility Pointer Control preferences to make your mouse and trackpad easier to use. The options available depend on the Mac you’re using.
To change these preferences, choose Apple menu > System Preferences, click Accessibility, click Pointer Control, then click Mouse & Trackpad.
Adjust the mouse or trackpad’s reaction time when you double-click an item.
Use the slider to specify how long an item has to be over a folder before the folder opens.
Ignore built-in trackpad when mouse or wireless trackpad is present
Disable the built-in trackpad on your Mac when you use a mouse or wireless trackpad.
If you use a non-Apple mouse, the driver software that came with your mouse may prevent this option from working as expected. For information, see the documentation for your mouse.
Click to set options for your trackpad:
Scrolling speed: Adjust the speed at which you scroll through documents and windows using the trackpad.
Scrolling: Select the tickbox to turn scrolling on or off. Click the pop-up menu, then choose an option to control what happens when you lift your finger from the trackpad:
Enable dragging: Select the tickbox to be able to drag items. Click the pop-up menu to choose an option.
Click to set options for your mouse:
Scrolling speed: Adjust the speed at which you scroll through documents and windows using the mouse.
Scrolling: Select the tickbox to turn scrolling on or off (for a mouse such as a Magic Mouse). Click the pop-up menu, then choose an option to control what happens when you lift your finger from the mouse: