Remove the Category field and display only the Location Field and Keywords Field on the Listify Theme.

style.css

.template-home .homepage-cover:not(.has-map) .update_results {
width: 100%;
}

.search_jobs > div.search_categories {
display: none;
}

@media (min-width:320px){
.search_jobs > div.search_location {
width: 100% !important;
}
.search_jobs > div.search_keywords {
width: 100% !important;
}
.template-home .homepage-cover.has-map .search_jobs, .template-home .listify_widget_search_listings .search_jobs {
width: 100% !important;
}
}

@media (min-width: 992px) {
.search_jobs > div.search_location {
width: 47% !important;
}
.search_jobs > div.search_keywords {
width: 47% !important;
}
.template-home .homepage-cover.has-map .search_jobs, .template-home .listify_widget_search_listings .search_jobs {
width: 70% !important;
}
.template-home .homepage-cover:not(.has-map) .update_results {
width: 30%;
}
}