General writing compatibility with mobile app

A while back, it was perfect. I could write seamlessly and erasing was not a hazard at all. Not to mention the undo feature. But now: It doesn’t let me write seamlessly. It forces everything I write to fall into straight lines. Also, the eraser is much thinner than before, and that’s unfortunate. I don’t like how they’ve ruined writing in Khan academy from before. It sometimes writes properly and sometime doesn’t. That’s inconvenient