Earlier this year, anyone wishing to disable or toggle the Trackpad on the Surface's keyboard could download the Trackpad Settings app. However, it seems that this app is no longer available on the Windows Store (even though it still has a web page, apparently). My search for a replacement has been fruitless, and even the Surface help docs still refer to this now-unavailable app.
So... given this situation, how can I toggle my Surface's trackpad?
Just to show it really appears to be gone...
Some search results
... and the store page for that one result.