Ensure built-in trackpad is enabled if using an external trackpad If this solution wasn’t what you needed, stay on the Pointer Control settings page you’ll need it for the next fix. For those who have trouble double-clicking quickly, you may want to drag the slider further to the left. A similar position to that shown in the image below is a solid option. Drag the slider for Double-click speed.Click Pointer Control on the left sidebar.Click Apple logo → System Preferences → Accessibility.
To fix the Double-click speed on your MacBook: This option may be the cause of your trackpad woes. If a new version is available, click Upgrade Now.