These CSS customizations need to be added to your website’s custom CSS. This can be done via Appearance > Customize > Custom CSS [unless your theme is taking advantage of FSE – full site editing]. Otherwise, you can add them to the style.css file of your child theme. One last alternative is to use a plugin that allows adding custom CSS such as https://wordpress.org/plugins/simple-custom-css/
How to hide the default category field from the add listing form
div.mb-3[data-argument="default_category"]{
display:none;
}CSS
Hide the default category field only for the places custom post type
.geodir-form-gd_place div.mb-3[data-argument="default_category"]{
display:none;
}CSS
Hide the default category field only for the events custom post type
.geodir-form-gd_event div.mb-3[data-argument="default_category"]{
display:none;
}CSS
Hide various types of near searches
/* Hide suggestions for IN search triggered by user input */
.geodir-listing-search ul.gdlmls-neighbourhood,
.geodir-listing-search ul.gdlmls-city,
.geodir-listing-search ul.gdlmls-region,
.geodir-listing-search ul.gdlmls-country {
display: none !important;
}
/* Hide API Near suggestions */
.geodir-listing-search ul.gdlmls-more{
display: none !important;
/* Hide automatic city suggestions that show when you click into the Near field */
.geodir-listing-search .list-group-item-action[data-type="city"] {
display: none !important;
}
CSS