Short answer: It depends on the aircraft/flight — FitsAir’s A320s are frequently listed with a small front “business” cabin (about 6–8 seats) on some sources, but other booking sites and customer reports describe the airline as operating all-economy services. (en.Wikipedia.org)

What that means for you:

• Airline-published fleet/configuration listings (e.g., fleet databases / Wikipedia) show A320s with a small premium/business section in some configurations. (en.Wikipedia.org)
• Several travel/booking sites and recent passenger reports say FitsAir markets some routes as economy-only or that the onboard service is effectively low-cost (snacks for purchase, etc.). (Wego.tw)

Practical next steps:

• If you have a specific flight in mind, check the seatmap during booking or the fare classes shown on the airline’s booking page — that will tell you whether a premium/business cabin is available on that flight.
• If the website is unclear, contact FitsAir reservations or your travel agent to confirm cabin layout and benefits for the exact flight/date. (I can look up their contact info or check a particular flight for you if you want.)