For the convenience of customers, you can set up a tooltip with popular cities on the checkout page to help them quickly select a city in the corresponding field.
To set the tooltip up, go to Settings → General settings → Checkout → Popular cities. To select a city, start typing its name in the field and choose the correct one from the drop-down list.
The Popular cities field is filled in separately for each language version of the site.
Please note: the Popular cities tooltip does not work if the Selecting a country at checkout option is enabled.