The steps below show you how to disable tap-to-click. The tap-to-click functionality for a Chromebook touchpad can be turned off while still allowing you to use the touchpad to move the mouse cursor. How to disable the touchpad on a Chromebook Disable touchpad tap-to-click functionality When your external mouse is unplugged or otherwise disconnected, the trackpad is automatically enabled again. How to disable the touchpad in Windows 7 and earlier Using a mouse and keyboard
Or, press Windows key+ I to open Settings and use the Tab, arrow keys, and Enter to choose Devices, then Touchpad.
See: How to navigate Windows using a keyboard. Once the touchpad is disabled, you need an external mouse to navigate in Windows, or you can use your keyboard to navigate in Windows.