The centre on aircraft button switches between to different modes:

Free mode Map is stationery, own aircraft symbol moves on the screen
Locked mode Own aircraft symbol is fixed on the screen, map moves below it

When active, the own aircraft symbol will stay in the middle of the page (with the exception of Track Up mode, where the icon will appear in the lower third of the screen – to show more of what is ahead).

If you need to look away from that position, simply pan the map and the lock will unlock.

Need more help with this?
Help Centre (Tap and hold to open the Link)

Thanks for your feedback.