The Filter style setting controls the appearance of your filter. Different options are available depending on the Filter type and the plugin version that you use.
CSS styling of filters’ elements has intentionally been left as “light” as possible, for filters to seamlessly fit into your existing shop theme. For customizations please use the annasta Filters section of WordPress Customizer (Appearance > Customize > annasta Filters), the Custom CSS field of annasta Filters style settings, or your child theme style sheets.