On page 38 / Listing 2.4 it says
“Return to activity_main.xml and preview your layout changes in the graphical layout tool. It should look like Figure 2.1.”
Figure 2.1 already has the right arrow inside the Next button which we have not come across yet.
Very minor clarification - I spent a bit of time trying to work out if I missed anything but then we add the icon on page 45 / “Adding an Icon”.
Thanks