If pressing the keyboard shortcut does not enable the touchpad, the advanced keyboard shortcuts are likely disabled. To enable the touchpad, press the Search key+ Shift+ P keyboard shortcut. To the right of the Enable tap-to-click option, click the toggle to the on position.
How to enable the touchpad on a Chromebook Enable touchpad tap-to-click functionality When your external mouse is unplugged or otherwise disconnected, the trackpad is automatically enabled again.
How to enable the touchpad in Windows 7 and earlier Using a mouse and keyboard
How to enable the touchpad in Windows 8 and 10 Using a mouse and keyboard Once the touchpad is disabled, you need an external mouse to navigate on the Chromebook.