I have a really good idea and I would be very happy if it really came to fruition.
Full Screen Mode - Most of the iPad's screen looks relatively small and you should utilize the entire screen for neat and optimized writing.
In addition to this is another tool control button idea,
  Instead of changing the tool from pen to pen every moment and then to pen again and then to marker and then to pen and then to eraser and pen again to do just such a large frost float that it can be swapped quickly saves a lot of time and convenience

You can actually see how it should look
Of course everything can be changed and moved by the floating tools.
And of course it will be possible to hide the button and the toolbar