Go ahead, drag the above slider left and right!
I have mentioned in the past about recalculating my tree in 23AndMe. I said you had to find out how to do it within the Help system. Arghh, finding where the function is located is a royal pain! But I did find it, and wrote the attached PDF document. If you are interested, you can download it. This is only for advanced folks. This worked for me, but let the buyer beware.
“If a machine is expected to be infallible, it cannot also be intelligent.” – Alan Turing