Hi,
Thank you very much for the details, it helps us a lot!
1. Do you mean like a drop-down field? For that you will have to create a front-end filter first, and then disable the search bar. In that case, the plugin shortcode will output the settings box instead of the search box.
2. For the live results you can change that here. If you mean the results page, that is probably hard coded somewhere in the theme, you might have to ask the theme author about that.
3. The problem is, that there are no post types selected, make sure to select the agents post type: https://i.imgur.com/74qsHL4.png
