Change Keyboard Hardware preferences for accessibility on Mac
On your Mac, use the Hardware pane of Accessibility Keyboard preferences to enable and set options for Sticky Keys and Slow Keys.
To change these preferences, choose Apple menu > System Preferences, click Accessibility, click Keyboard, then click Hardware.
Enable Sticky Keys
Press a set of modifier keys one at a time in sequence, instead of all at once. For example, you would enter the key combination Option-Command-F5 by pressing each key in sequence.
To customize Sticky Keys, click Options:
Enable Slow Keys
Adjust the delay between when you press a key and when it’s activated.
To customize Slow Keys, click Options:
To specify which options are available in the panel, choose Apple menu > System Preferences, click Accessibility, then click Shortcut.