The timer button floats and can be moved around but I have managed multiple times to make it totally disappear off of the screen. At that point, I can't use the timer and I am sad.
Also, if the timer hasn't been started yet, it seems like the icon should be a play button but the icon is always a circular arrow (more like a reset button) even if I haven't used it yet. This was unintuitive to me at first and took me a bit to understand how to use it.