1. The search bar in question is still pulling “Vendors” from somewhere – I’ve eliminated it from the sidebar fields but don’t know where this is set in settings.
If that is the CPT selector, then, remove all vendor listings and/or delete the CPT.
2. Is it possible to create a Category Drop Down menu option here in the search fields?
Yes, https://wpgeodirectory.com/docs/gd-search/#cat
3. Is it possible to create a Multiple Town Drop Down menu option here in the search fields?
No, but the Location Switcher can be added as a shortcode or a menu element: https://wpgeodirectory.com/docs/multilocations/
4. Button doesn’t inherit child/theme colors – will try to fix with css later today or tomorrow.
Please send a URL and a screenshot and a description of what you are looking for and we will try to help.
5. Business name search field is very white – can’t see that there’s a field there… Anyway to get this smaller with the search button below next to it.
In terms of CSS, what are you looking for? URL?
6. And then main issue from the start – how to ad a category display or drop down here?
In the sidebar, you would use a widget like Popular Categories. It does not have a dropdown though.
In the search bar: https://wpgeodirectory.com/docs/gd-search/#cat