A proposal to replace the Charts Default Params modal, by a dedicated view called Charts settings.
It is still accessible from any Charts view through the"Default Parameters" button.
When user click on the #Go back to the charts" button,he|she goes back to the charts view he|she came from. For the moment, changes settings are not taken into account when displaying back the charts view. I think it is because, I used the history.goBack(), and it does not re-render the view, just display it back.
Have a look when you have time, thanks.