I'm using a Dell touchscreen Chrome Book that's all I know. It doesn't work in full screen mode either in case your wondering since in the screenshot its not in full screen mode. Sorry for late reply.
I'm guessing this doesn't work for you with either touch or trackpad (if you have one)? Anyway, the new update with many control changes to support mobile devices should be out soon!
I'm using a Dell touchscreen Chrome Book that's all I know. It doesn't work in full screen mode either in case your wondering since in the screenshot its not in full screen mode. Sorry for late reply.