From theme options:

Help – https://help.wprentals.org/article/1-30-how-to-manage-submit-form-fields-and-mandatory-fields/

From Custom CSS

[for="city_fee"] {
display: none;
}
[id="city_fee"] {
display: none;
}
[for="city_fee_per_day"] {
display: none;
}
[id="city_fee_per_day"] {
display: none!important;
}
[for="city_fee_percent"] {
    display: none!important;
}
[id="city_fee_percent"] {
display: none;
}