Allow selection of multiple values for Drupal Facets (Facet API + Search API)

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I am using Facet API + Search API to develop Filtering for the data within my site. I am also using Ajax Facet Filters to process the selection as soon as it's clicked.

It all came out great but there's one slight problem. I can only select one option per category. As soon as I select an option, all the inactive options hide and only the active (clicked one) shows.

I want the option to select multiple option but with my settings of Facet API & Search API, there seems to be no option.

Here's the picture to explain. enter image description here

I'll be very thankful for any assistance.

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Thats because you are using backDatabase Search.

Use Apache Solr backend.