WooCommerce Product Filters lets you choose from a wide range of filter styles, including dropdown filters, checkboxes, radio buttons, and more. These styles are used in the filter widgets that appear in the sidebar. When you create a filter in the WordPress admin, an option will appear letting you choose a style for the filter. You can add as many filters as you like, in as many different styles as you like.
The filter plugin also lets you display filters horizontally above the list of products - for example, at the top of the main Shop page. When you do this, all the filters are initially displayed as dropdowns. This helps to save space on the page. Customers click on a dropdown to open up the filter and see the options.
WooCommerce Product Filters also has a 'Dropdown' filter style, which is always displayed as a select list. You can choose between two ways to display dropdown filters:
A single dropdown list - If your data is hierarchical (e.g. categories) then the sub-categories are nested under their parent category.
Multiple step-by-step filters - For hierarchical categories and taxonomies, the customer selects a parent category from the first dropdown filter. The sub-categories then appear in a second dropdown filter alongside. This continues depending on the number of levels in your hierarchy. That way, customers can perform a step-by-step filter to drill down your products.