The intro screen on the Raspberry Pi version of Mathematica contains links to the online documentation, the Wolfram website and the Wolfram community forum. Often, I find myself closing my notebooks and thinking there's one other thing I'd like to do in Mathematica. However, at this point, I have not officially closed mathematica, since the intro screen is still visible, but I can't open a notebook or create a new one since the intro screen does not have a menubar or any links to facilitate opening/creating notebooks.
As the next version of the Mathematica for Raspberry Pi is being considered, perhaps it would be helpful to adjust the sizes of the current image/links and include a few more to open/create notebooks. It would be very handy.