In case, you only want to show locations which was included in job postings. Please go to framework/job/job-default-fields.php> change this code

Or you can override function jm_job_tax_search_field_params in childheme. To override a function, you will paste all codes of that function into functions.php file in childtheme:

You can refer to our documentation to know how to override:
https://nootheme.com/knowledge-base/override-parent-theme-function-childtheme/