Why is so hard update the pdf reports files?!

Hey folks! How are you?

I'm feeling sooooo frustrated really.
I've been trying to update the account.report_invoce_with_payments pdf report file but I wasn't be able to do it.

I tried to do it on the good way (Best practicles).

I created a new View, I tried to configurate them, I used xpath lines BUT I DON'T SEE MY CHANGES, anyone of them.

How was your experience on those changes?
I feel somewhat lost between views, templates, inheritances, actions.
Does someone can/want to help me about it?

My change should be VERY simple! I have to move the customer details (yelow square) to green square.

https://preview.redd.it/y16t63o1uvkg1.png?width=787&format=png&auto=webp&s=396332dd0b3d01e333aadc56294b245419a2e821

I'm going crazy

Thanks!