If one facet has only one value to choose from it will be hidden.
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Download the latest release as .zip file from here: Releases
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Refer to this guide (only the last step): Manually installing plugins
In the root of your Shopware Installation run
$ cd custom/plugins
$ git clone https://github.com/simkli/SimklHideSingleValueFacet.git
$ ../../bin/console sw:plugin:install refresh
$ ../../bin/console sw:plugin:install --activate SimklHideSingleValueFacet
$ ../../bin/console sw:cache:clear
Please see License File for more information.