different domains disabled in polylang

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Short: In Languages -> Settings -> URL modifications , the options "The language is set from the subdomain name in pretty permalinks" and "The language is set from different domains" are disabled. Why is this and how can I make these boxes selectable? I am particularly interested in the last option (different domains). Versions: Wordpress 5.5.1, Polylang 2.8.3 Background: My goal is a bilingual…

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