What is Google Knowledge Graph
Learn everything about Knowledge Graph on Google official website.
Setup Google Knowledge Graph
To enable Google Knowledge Graph, go to SEO, Social Networks.
In Knowledge Graph tab, select Person or Organization, type your name or organization name, and select a photo.
If you choose Person you can pass a WordPress user ID to the dedicated field.
The image you select in Photo / Logo URL is published as the logo of an organization. Since SEOPress 10.4, when you choose Person, it is published as the image of the Person schema: a person has no logo property, so the photo was not published before.
The Email field is public: for an organization, it is published in the contact point (contactPoint) of the Organization schema. Enter an address you want visitors and search engines to see. Since SEOPress 10.4, the setup wizard no longer copies the administrator email into this field. If you ran the setup wizard with an earlier version, check this field and change or empty it if it holds an address you do not want to publish.
Your accounts from the Social Accounts tab are published as links (sameAs) in the same schema. Since SEOPress 10.4, an X account saved as a full profile URL by an earlier version (for example https://twitter.com/yourname) is read correctly and published as https://x.com/yourname.
Save changes.
It can take weeks or months to see your Knowledge Graph in SERPs.

Print the WebSite and Knowledge Graph schemas in a single @graph
By default, SEOPress prints the Knowledge Graph schema (Organization or Person) and the WebSite schema of your homepage in two separate <script type="application/ld+json"> tags. Both carry an identifier (@id), and the WebSite schema points to your Knowledge Graph as its publisher, so search engines already read them as connected.
Since SEOPress 10.4, you can merge them into one block instead. Go to SEO, Advanced, Advanced tab, Structured data section, and enable Single @graph output: Merge the WebSite and Knowledge Graph schemas into a single @graph. Save changes. The option is off by default.
This changes how your structured data is presented in the source code, not what it means. Your other schemas keep their own script tag. Learn more, including what changes for developers, in How to add schema markup to WordPress using the SEOPress plugin #2.