I have the Beautiful Basic & Reversed Cards Template from Anki Decks and now I would like to deactivate that always two cards are created - so I would like the design but only one “basic card”.
That note type seems to have two card templates - but you only need one.
Head into the
Cards... editor, open the dropdown menu on the top and select the second card template, then click
Options (top right) and remove that template.