You’re talking about two deferent things. 1) Arrow display is the one that will point out if you’re going to make a right or a left on the turn, and only works if you have a destination turn on. 2) Current position is the one that you can have ON at all times, and it tells you direction of North, and also the current street that you are driving. I’m sure your iDrive is working fine you just had them mixed up.
let me know if you have any other questions. You can also use your voice commands to activate them both. Example: Assistant window, Current position.