Displaying category filters doesent work with new attributes

Hello.
I wanted to add another filter for a category. After that, I created attributes and have already added them to products. In WOOF, I have also already assigned settings for this attribute. But if I now want to add the filter in the category settings in WooCommerce, it is not suggested to me in the drop-down, what can I do?

btw: I am new with the plugin and have not worked with it yet.

Best regards and thank you for the nice plugin!

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