How to add a multi select category and attribute filter on catalog page

Question

My magento 2.3.3 theme provides me single select from same category or attribute.

Here if i select a sub category all the other categories will get disappears because it is single select. But i want is a multi select filter where i can filter multiple sub categories and attributes. Like this

Is there any free extension or we can do it by custom module. Please Guide me.

Answer 1

For that, I suggest you to Refer Welt Pixel free/paid extension.

https://www.weltpixel.com/improved-magento-2-layered-navigation-ajax-filter-multi-select-price-slider.html

Hope this will help you.