Greetings,
Yes, connecting this Samsung washer to the Wi-Fi network is optional.
If you want to use the unit remotely in the future utilizing the washer's "Smart Control" feature, please see the manual link below and page 45 for information.
User manual.
https://downloadcenter.samsung.com/content/UM/202401/20240118131419104/OID65777_IB_WA3500C_EN_240110.pdf
-Kimberly