Hi Tony,
Thanks for your help with this.
I have logged a support incident with Ancestry as you suggested.
I have also attached the 2 screenshots that show the difference between the Windows Version and the Mac Version.
Not I see the Windows Version again, its clear that the windows box in that respect is locked in place, and looks far better than what they have done with the Mac equivalent, so I cant see that the mac version is by design at all.
Lets see what they say, as its very annoying having to go to each child to see the birth and death dates, when before I could just glance at the list and see it all!