The Filter Everything plugin allows developers to easily change the appearance of the Filters widget by using their own templates to display Filters.
To replace a standard Filter template with your own, all you have to do is create a folder named “filters” in the folder with the active WordPress theme and copy there one of the plugin templates that located in /wp-content/plugins/filter-everything/views/frontend/
Here is their list:
../apply-button.php
../bottom-controls.php
../checkboxes.php
../chips.php
../dropdown.php
../filters-button.php
../labels.php
../orderby.php
../posts-found.php
../radio.php
../range.php
For example if you want to override the Checkboxes view and your active theme folder called “storefront” the path to the overriden file should be: /wp-content/themes/storefront/filters/checkboxes.php
Edit templates as you need and create your own unique Filter widget for your site.