Use the fast food restaurant reference as a requirements checklist before treating a player layout as a copy-and-paste solution. The supplied material identifies customer service and cleaning as relevant employee training areas for profit and customer satisfaction.
Official Big Ambitions screenshot — source.
Plan the required business pieces first
The reference separates required items, optional items, products, and optional products. Work through those groups in the in-game business setup rather than placing furniture only by appearance. A layout should leave enough usable space for required equipment, product display, staff activity, and customer flow.
Official Big Ambitions screenshot — source.
Staff for the work the restaurant creates
The source calls out Customer Service and Cleaning training. Treat staffing as part of the layout: a restaurant that looks complete can still perform poorly when assigned roles do not cover its opening hours and product mix.
Test before scaling
Open one restaurant, watch stock and customer satisfaction over several in-game days, then change one variable at a time. Community layouts are useful inspiration, but their building size, version, product choices, and staffing assumptions may not match your save.