Unable to save a new theme in keynote
I created a new slide layout (which is in the layout chooser). However, if I want to save it as a theme or add to the theme chooser I wind up with the same pre-set title subtitle layout from apple. This happens no matter whether I save theme from the regular keynote window or from the edit slide layout window.
What am I missing?
MacBook Air 13″, macOS 10.14