How to show post relation filter on Voxel theme's search form widget

Natively, Voxel theme doesn’t show any frontend filter for search form widget.The UI filter for the Post Relation of the Advanced Search Form addon within the Essential addon for Voxel theme is a feature that allows you to filter search results based on post relation fields. This means you can search for posts based on another post type by this Voxel addon. For example:

1. If you have a post type “doctor” and “hospital” linked to each other through a post relation field, you can set up a search to find doctors based on hospital.

2. If you have a post type “job” and “company“, you can search for jobs based on company.