Choose a post's main category
When a post is in several categories, choose the one used in its address, breadcrumbs and structured data.
Give the post two or more categories
Edit the post and tick its categories.

Choose the main one
In Search and social, choose the Main category. Chosen by WordPress keeps WordPress's own choice.

Check the address
Addresses that include the category now use the main one, and so do the breadcrumbs. The old address redirects.

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