How to change themes in report

Hi,

I am trying to change the theme of customer reports I generate. I used to be able to change themes before using the drop down list on the view page. After latest updates, this option is no longer available.

How do I change the theme of statements?
I have created a new theme for my invoices and such but each time I create a new invoice it creates it in the default theme. Can we please make it so that we can change the default.

read below topic.

read below guide and topic.