Hi gbotley,
Yes, it’s a new change for arming approach for 2D and LNAV/VNAV approaches, you must be tracking to the wpt that is on the coded approach and has the Vert slope. This is usually the IF.
If you didn’t get the any arrows, blue or white, then maybe you didn’t have all the required parameters. Best check with the Instructor. (Is it an older SIM/VFD?)
Yep, make sure the FDP is the next WPT, and it should do as advertised. ( but it’s an Airbus, so sometimes it’ll do something else😂😂
There is lots of this sort of thing in this funny little aeroplane, but once you get a handle on it, you can sit back and watch the magic happen