In settings for PDF Themes I changed to use the 'Clean' Theme to my default expecting that this would actually be the new default for ALL documents produced from that point going forward. Apparently not so. i would have to go into every one of hundreds of customer records manually to change them to use the new theme!!!
This is not helpful at all :(
Please make it so that a change here then uses either the 'Clean' or the 'Classic' theme for all future documents. You could even add a flag to say if that is what you want to do.
I think this is a poor piece of design that should be very easy to fix.