Use this css and add in theme options – design – custom colors – custom css or in child theme

Remove Cities

[id="a_filter_cities"] {
display: none;
}

Remove Areas

[id="a_filter_areas"] {
display: none;
}

Remove right border (for design consistency)

.listing_filter_select {
border-right: 0px solid #f0f0f0;
}

Original design/functionality

After removing cities or areas with CSS