I also have this problem when I did it, and I fix the problem
=====at Bed auto leveling setting====, you can see that there is a "#define DELTA_PROBEABLE_RADIUS (DELTA_PRINTABLE_RADIUS - 10)",
this is set the DELTA_PROBEABLE_RADIUS, but this is not gonna work.
Above this line, at the top of =====Bed auto leveling setting=====,
you can find a " //#define AUTO_BED_LEVELING_FEATURE // Delete the comment to enable (remove // at the start of the line)"
So what you should do is to Delete the comment.