How do I change contacts shown under the share screen?

[Guest T'hain Esh Kelch]

If I select, say an image, and press the share button (Square icon with an arrow), I get to choose what to do with the image. I have a list of quick contacts at the top, and how do I change them? Currently I only see contacts from WhatsApp, which I essentially never use, and no iMessage contacts which I use all the time.

 

My Google-fu and Settings-roundtrip didn't get me an answer unfortunately.

 

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