In Professional, the start up screen under "New From Template" now hosts those gigantic tiles for templates, but if I choose File - New... I get the old style dialog with templates in a plain list. I have a lot of templates and would like to only ever see the old style with the list. The huge tiles don't add functionality and simply make finding the template you wanted more difficult. How can I change this?

Hi. On the top right corner (IIRC) there is a list, and a tiles button to change view.
Perhaps it will help to change to list view?
All the best.
Edit: I was wrong. It can only be done from the last projects screen.

Not a fan of the start screen as I found it took me to the wrong version of songs I had recently backed up and this is not exactly clear.
So I don't use it.
I just open Sonar and use the good old "File/ Open" menu which takes me the my Sonar project drive where I have a few folders. One folder is labeled "Templates"