If you have wondered how to rotate objects (furniture, ingredients), here is a short summary for you.
Chairs and tables can not currently be rotated manually. Guests will not arrive until the chair has been placed directly at a table. The chair adjusts its rotation to the table.
Ingredients are rotated with the keyboard key "R". In addition, ingredients in 3 different sizes can be used. Select ingredient and use the cutting board, bottom right at the pizzacreator.