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All the changes you make are reflected in 2 places - Calculation Lines and Payment Calendar. For more information about general contract changes see attached video:
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https://www.youtube.com/watch?v=LPYMrWzxQNM&list=PLGrwYyCxmp1RjVv_gk7TzUZpOnhoOUDot&index=20
In this case, we are choosing the process of changing Financing Rate, which is described below:
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Changes you made are also shown in section Process, concretely in Calculator Lines and Payments Calendar.
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Follow up:
How to change financing period
How to change principal amount