If the option “Force tariff,” in the Admin Panel is enabled, the driver will not be able to choose as they system will choose the tariff for them. If this settings is disabled, the system will highlight the correct one based on the tariff rules but also let the driver decide which one they would like to use.
The “Force tariff” settings can be found by going to “Settings - Dispatch - Payment options” under the “General” tab here: https://admin.taxicaller.net/admin/settings/dispatch.php