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Filter Everything Extra is a simple yet useful add-on plugin that adds additional functionality to the <a href="https://wordpress.org/plugins/filter-everything/" rel="ugc">Filter Everything</a> plugin.
With Filter Everything Extra, you can easily select all filter items, clear the selection, or invert the selection, which is particularly useful when there are many filter items. For example, if there are 25 brands in one filter and you want to search all brands except one, you can select the unwanted item and then invert the selection with one click instead of selecting the other 24 items one by one.
Once Filter Everything Extra is installed and activated, you will see All, None, and Invert buttons at the top of existing filters. These buttons are available on filters that use checkboxes or label lists.
The All button selects all items in the filter, None clears the selection, and the Invert button inverts the current selection.

Filter Everything Extra

Additional functionality for the Filter Everything plugin.

Filter Everything Extra vs YITH WooCommerce Ajax Product Filter