All panels are shown closed by default. Pages, Layers, Libraries and Symbols are located on the left, just like in the normal interface.
Same as in the normal interface, the Page Appearance and Comments panels are located on the right, is shown when there’s nothing selected on the canvas.
With an element selected on the canvas, the rest of the panels are displayed on the right.
How to rearrange and change stacking orders
Similarly to the normal interface, on Touch, to change the stacking order of a Layer, Page, Fill, Border or Effect, you need to drag and drop, but here you need to use a long-press to select before dragging. Select using long-press, then you’ll notice that the item you’re selecting will be highlighted in magenta.
Then just drag it either to change the order:
Or drag to place one layer inside another one: