I have a trouble with this because the editor ask for rules for the one who left...
Yes, that's what I thought, but it seems to work only for the top three in each group in the competition itself, otherwise in the team history their league history stops showing.
Great thanks I will look it !
Edit: The @krlenjushka file seems to be a good basis, I didn't know that it was possible to anticipate the change to a different number of child competition in Child Competition/Regional Rules.
Thanks again for your help @crooy3 !