Slide show only 9 scenarios?

I want to make a 10 scenarios campaign but slide shows only support 9 scenarios,how can I make it change?I searched the officials json and do not find the json which control it.

As a player of this game for 21 years
I want you to know I have NEVER ever looked at the slideshows before a campaign.

You never look at it is your right,but others needs.