sorry, easy question here i think..... i want to use 2 apps together, that are both ios11 optimised. 1) for instance, i want to use "Notability" and the "Calculator HD" app, both on my front screen, together. none of which are in my dock. how do i achieve this? 2) can i have 3 or 4 or more apps open together or displayed at the same time on my screen?