How to change the size (zoom in/out) of the HUD track map

I must have missed something obvious with the new HUD, but how do I change the zoom level of the map?
I want to zoom out a bit as currently the corners often appear into view too late, so when learning a new track I spear off !
With the old HUD I could use the editor to change the track map, but don't see how to do it now
Thanks all
 
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