UPGRADE Issues – many

Are you talking about the missing icons?
You have this CSS as part of your theme:

.geodir-company_info i, .geodir_post_meta i, .geodir-company_info .svg-inline--fa, .geodir_post_meta .svg-inline--fa {
    margin-right: 4px;
    display: none; 
}

I added this CSS to your custom CSS to over-write that:

.geodir_post_meta i {display: initial !important;}

To change from tabs to list, I changed the shortcode in the GD Details template from

[gd_single_tabs]

to

[gd_single_tabs show_as_list="1"]

Added some CSS for the address.

Corrected your locations page shortcode from

list_sort_by="az"

to

sort_by="az"

PS: always use the shortcode builder to build or check your shortcodes.

GD > Settings > Advanced Search > Enable search autocompleter? > NO