How can I modify the address field on the checkout page?

Topic summary

Goal: Restrict shipping to a limited area by pre‑setting address fields at checkout—e.g., default city as Istanbul and prevent selecting/typing other cities (also district/neighbourhood defaults).

Key clarification: A participant asked whether the store uses Shopify Plus (enterprise plan that allows advanced checkout customization). The merchant is not on Plus.

Constraint/outcome: Without Shopify Plus, the checkout page’s address fields (city, district, neighbourhood) cannot be modified to enforce defaults or limit choices during checkout. The only editable area suggested is a modal on the thank‑you page (post‑purchase), not the checkout itself.

Implication: The requested behavior (locking city to Istanbul and restricting other locations during checkout) isn’t achievable on standard Shopify plans through checkout customization.

Status: Unresolved beyond acknowledging platform limitations; no actionable workaround at checkout level provided.

Summarized with AI on January 7. AI used: gpt-5.

no i want to for example city is coming to default is istanbul no selected other typing cities only typing is istanbul